Dodge

Dodge Repair Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Dodge
This answer was rated:

1996 dodge neon: automatic..it finally does it idles extremely rough

I have a 1996 dodge...
I have a 1996 dodge neon 2.0 automatic it is very hard to start and when it finally does it idles extremely rough. after a few minutes of running if i leave it idleing it will smooth out but if i put my foot on accelerator it runs rough or dies and if i put it in gear it dies or if i put foot on brake pedal it will die
Show More
Show Less
Ask Your Own Dodge Question
Answered in 37 minutes by:
2/28/2010
Ricardo Hohl
Ricardo Hohl, Master Certified Tech
Category: Dodge
Satisfied Customers: 4,304
Experience: Automotive instructor at Porter and Chester institute
Verified
hi, you seem to have a fuel problem have you replace the fuel pump, or check for pressure?
Ask Your Own Dodge Question
Customer reply replied 7 years ago
the fuel pump is new and the return filter is new the fuel pressure is close to 40 psi with key on engine off with engine idleing it hovers around 20 and does'nt stay steady
ok that is not good you should have from 45to 55 psi when running and 40 psi with key on engine off, you must have a bad fuel pump or filter clogged.
Ask Your Own Dodge Question
Customer reply replied 7 years ago
i recently bought the car from my friend you can see the fuel pump is new it is an airtex plus I have the receipt it is only a couple of weeks old
ok, it can be new and defective and the pressure its showing means you need another one , make sure you check the fuel filter to.
Ask Your Own Dodge Question
Customer reply replied 7 years ago
i just called my friend he told me the car was dying randomly and his dad put the pump and filter in he said the car still wouldnt run like it should
Customer reply replied 7 years ago
i was wondering what are the odds the pcm are bad or the throttle postition sensor
hi, sorry for the delay, you say the fuel pressure is around 20 psi when running, and if so i tell you right know that is the problem on this vehicle you need to check the fuel pump operation it needs to go back to 45 psi if you change the fuel pump it is possible there may be a restriction some ware, can you do a fuel pressure test again and confirm the pressure for sure ?
Ask Your Own Dodge Question
Customer reply replied 7 years ago
fuel pressure just past 40 and if i turn the key off and on it raises past 40 but when you start the car 20
ok, then you need a pressure regulator it is not reserving pressure at the rail, those the fuel regulator at the rail has a vacuum connected to it?.
Ask Your Own Dodge Question
Customer reply replied 7 years ago
i don't see a regulator on the fuel rail just the supply line and the injectors coming out of it
Customer reply replied 7 years ago
i figured out that the regulator is on the pump in the tank and is new with the pump which brings me back to car running rough and dying before the pump was even replaced
Customer reply replied 7 years ago
today i read on the internet how to read codes without scntool i have several codes but i don't know what they mean 12,51,42 and 55

i am sending you this picture and information just to show you that the fuel pump pressure should be more then 20 psi , the reason for the engine lights and codes is because the low fuel pressure problem is affecting other sensors like 02 sensor and map sensor

Notes

Fig. 2 Side View-Filter/Regulator


A combination fuel filter and fuel pressure regulator is used on all gas powered engines. It is located on the top of the fuel pump module.

  • A separate frame mounted fuel filter is not used.

Fuel Pressure Regulator Operation: The pressure regulator is a mechanical device that is calibrated to maintain fuel system operating pressure of approximately 338 kPa (49 psi) at the fuel injectors.

It contains a diaphragm, calibrated springs and a fuel return valve. The internal fuel filter (Fig. 2) is also part of the assembly

Fuel is supplied to the filter/regulator by the electric fuel pump through an opening tube at the bottom of filter/regulator.

The fuel pump module contains a check valve to maintain some fuel pressure when the engine is not operating. This will help to start the engine.

If fuel pressure at the pressure regulator exceeds approximately 49 psi, an internal diaphragm closes and excess fuel pressure is routed back into the tank through the pressure regulator. A separate fuel return line is not used with any gas powered engine.

 

Ask Your Own Dodge Question
Customer reply replied 7 years ago
ok I traded fuel pumps and installed new one ran fine for about ten minutes and same problem reocurred runs rough after i killed it and went to start it again it was really hard to start
ok, do you have a fuel presure tested with you right know?
Ask Your Own Dodge Question
Customer reply replied 7 years ago
it has 40psi when key is on but when idleling it hovers around 25 so it is pretty much the same as before
ok so its still at low presure when on drive . ok do you have a voltmeter we need to check if the voltage to the fuel pump changes also when shifted, if you do i will gide you on checking by testing the fuel pump relay
Ask Your Own Dodge Question
Customer reply replied 7 years ago

yeah i have a volt ohm meter i have checked voltage at the fuel pump at the key on position and it is at 12 volts

how about when running?
Ask Your Own Dodge Question
Customer reply replied 7 years ago

it has 12 volts briefly then fluctates after testing this i checked and replaced the relays bothe fuel and auto shutdown relay

do the voltage fluctuates between 14 volts and 9 volts?
Ask Your Own Dodge Question
Customer reply replied 7 years ago
no between 7 and 12 volts
ok if this is the voltage when engine is running then its wrong you should have 12 volts with key on and ENGINE NOT RUNNING and 14 .3 volts with key on ENGINE RUNNING ok can you check the voltage at the battery with engine running?
Ask Your Own Dodge Question
Customer reply replied 7 years ago

voltage at the battery is 14.52 volts when engine is running

 

good then that is the voltage we need to have at the fuel pump . somenthing is shorting out the power to the fuel pump , lest check the fuses at the outside fuse box with the voltmeter see if they have 14.5 volts also with engine running .
Ask Your Own Dodge Question
Customer reply replied 7 years ago

ok at the fuel pump fuse i have just over 14 volts

and at the fuel pump it goes from 12 to an average of 10

Customer reply replied 7 years ago

i just checked all wires at the fuel pump one has 13 volts one has 10 the other has 10 and on has 9

you need to check for a ground missing one of those wires is supposed to have a ground , here is the schematic you are supost to have 2 power wires and 2 ground wires its posibl
e for one ground to be missing.
Ask Your Own Dodge Question
Customer reply replied 7 years ago
ok 2 are hot and two are ground i checked two for continuity to chassis and i have two grounds

what is the voltage at dose 2 wires that have power?

Ask Your Own Dodge Question
Customer reply replied 7 years ago
10 and 9
Customer reply replied 7 years ago
i need to add to that if the car has been running for a few minutes the voltage goes up to almost thirteen and 10 but when just started 10 and 9
ok, lest first check for how many volts are precent at the fuel pump relay with a voltmeter check for two powers at the fuel pump relay with key on use the schematic i am sending you it shows the location of the relay and the powers on the conectors test them and let me know what you get.make sure you copy or print this page.
Notes

Fuel Pump Relay


Fig. 15 Power Distribution Center (PDC)


The fuel pump relay is located in the Power Distribution Center (PDC) . The inside top of the PDC cover has a label showing relay and fuse location.

 

you copy or print this page.
Ask Your Own Dodge Question
Customer reply replied 7 years ago
ok one is 11.80 the other is 11.91
ok voltage is ok, withing battery voltage, can you replace the relay and check the voltage at the fuel pump again you can use any relay in the same box.
Ask Your Own Dodge Question
Customer reply replied 7 years ago
i have actually already done that it doesnt matter i have the same result i actually bought two new ones just to be sure
oklest check the power output from that relay to the fuel pump, install awire in to cavity #52 and insert the relay over it and check how many volts are present with key on?
Ask Your Own Dodge Question
Customer reply replied 7 years ago
ok i have 11.90 with key on but it drops to nothing right away but when cycling key it goes back up to 11.90 then drops again
ok how about with engine running?
Ask Your Own Dodge Question
Customer reply replied 7 years ago
just over 14 volts

one last voltage check , disconect the fuel pump and with key on check power.

Ask Your Own Dodge Question
Customer reply replied 7 years ago
just over 10 volts
ok you have a wire between the relay and the pump conector open or shorte causing a voltage drop and this is affecting the fuel pump ability to maintaine presure.you can try ussing a jumper wire from the relay output, and to the fuel pump conector you will have to cut the wire that powers the fuel pump and replace with this wire just to try.
Ask Your Own Dodge Question
Customer reply replied 7 years ago
does the voltage go through the pcm after the relay or before im just wondering the last time i experienced low volts to fuel pump on my truck the pcm was actually bad i went through the hole ordeal of tracing wire and it turned out that there was a short in the pcm
no this wire comes out of the relay and goes strate to the pump the computer only grounds the relayto turn the pump on.
Ask Your Own Dodge Question
Customer reply replied 7 years ago
is it possible there is a bad ground in the computer
no because if it was the relay would not activate the pump.the relay needs full ground to switch power to the fuel pump, have you check for a fuel filter posibly clogged?
Ask Your Own Dodge Question
Customer reply replied 7 years ago
the fuel filter is brand new

ok, we cover all the basis of posible fuel restrictions and electrical flows and found no problems but still cant explane the lost of presure, one last thing we can do is baypass the circuit and run a wire strait from the positive side of the battery, and another wire for grownd start the car and check fuel presure again.

Ask Your Own Dodge Question
Customer reply replied 7 years ago
ok i ran a wire from relay to the pump car runs great that way what next
Customer reply replied 7 years ago
ok ive figured out that i have voltage at my ground connections to the fuel pump i believe this is voltage from a shorted power wire. my question is where does the wire go from the relay to the pump what route does it take through the car and what colors does it change to
ok, that shous you that you have a shorted wire from the relay to the fuel pump,you are going to have to replace that wire from the relay output on to the fuel pump and the same with the ground wire.can you check the fuse shown on this schematic with a voltmeter and see if voltage is there when runing 14 volts and not running key on 12.5 volts fuse 10 inside the vehicles fuse box.
)

Fuel/Ignition Systems (Part 12 Of 13)

Fuel/Ignition Systems (Part 13 Of 13)


NOTE: To view sheets referred to in these diagrams, see Diagram Information and Instructions/Complete Body and Chassis Diagrams .
Ask Your Own Dodge Question
Customer reply replied 7 years ago
ok there is 14 running and 12 koeo
ok, that fuse is ok the problem is like i sad on that wire going to the fuel pump you are going to need to cut the wire right from the relay and cut right at the fuel pump conector and run another wire to bypass that wire and just tape up the wire in the harness nice and neat. you mention before somenthing about having power at the groundwire?
Ask Your Own Dodge Question
Customer reply replied 7 years ago
yeah both ground wires to the pump show voltage as well as having continuity to ground
ok that is were the short may be just run the wire from the relay to the pump and eliminate the old wire .
Ricardo Hohl
Ricardo Hohl, Master Certified Tech
Category: Dodge
Satisfied Customers: 4,304
Experience: Automotive instructor at Porter and Chester institute
Verified
Ricardo Hohl and 87 other Dodge Specialists are ready to help you
Ask your own question now
Ask Ricardo Hohl Your Own Question
Ricardo Hohl
Ricardo Hohl
Ricardo Hohl, Master Certified Tech
Category: Dodge
Satisfied Customers: 4,304
4,304 Satisfied Customers
Experience: Automotive instructor at Porter and Chester institute

Ricardo Hohl is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

I AM VERY GLAD THAT I TOOK A CHANCE ON YOUR PROBLEM SOLVING SKILLS. I WAS SUCCESSFUL IN REPLACING THE FUEL PUMP. MY TRUCK RUNS LIKE A CLOCK. IT RUNS LIKE THE DAY I BOUGHT IT. NO LUNGING FORWARD, THE TURBO REACTS THE SECOND I STOMP ON THE GAS, AND IT HAS A LOT MORE POWER AND EVEN SOUNDS BETTER TO ME. IT SAVED ABOUT $500.00 BY DOING THE WORK MYSELF. I GIVE YOU ALL THE CREDIT FOR YOUR DIAGNOSING THE PROBLEM, JUST FROM THE SYMPTONS I GAVE YOU OVER THE e MAIL. I WILL USE YOUR WEB SITE AGAIN AND REFER MY FRIENDS. THANKS SO MUCH FOR THE HELP.

TOM WHITTAKERUSA

Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless!

Rev. Jerry BaysingerHolts Summit, Mo

I recently asked a question about my 2005 dodge ram, and I just wanted to let my Expert know that he hit the nail squarely on the head with his answer. I wanted to thank him again.

GregPittsburgh, PA

Just a quick line to tell you how pleased I am to have my brakes working properly after all this time. Your answer was what I needed. I would certainly recommend you highly. God bless!

JerryHolts Summit, MO

I was skeptical at first but thought I'd give it a try. I was pleasantly surprised. Your site actually is a quality service that I would recommend to others in a heartbeat.

StanSayre, PA

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

< Previous | Next >

Meet the Experts:

Jerry

Jerry

Master Mechanic

1,754 satisfied customers

ASE Master tech, 30 years exp. troubleshooter, driveability tech

Chris

Chris

Shop Foreman

6,613 satisfied customers

Dodge/Cummins and Chrysler Certified Master Tech

Mopar Certified

Mopar Certified

Dodge Technician

5,931 satisfied customers

24 Year Chrysler/Dodge Certified Specialist

moparfl

moparfl

ASE Certified Technician

3,292 satisfied customers

ASE Master Tech Gold level Chrysler Status 30 years dealership exp

Dodgerench

Dodgerench

ASE Certified Technician

2,809 satisfied customers

30+ years Dodge/Chrysler exp., ASE Master with L1 certification. Driveability/ combustion specialist

Tim Mohr

Tim Mohr

ASE MASTER TECH

2,298 satisfied customers

30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL

Don - Mo Lurch

Don - Mo Lurch

Aftermarket & Factory Electronics

1,562 satisfied customers

Cert. Dodge & Chrysler Warnty, Heavy Line Mech, Mobile Electronics. Sales, Installation & Repair for 30 years

< Previous | Next >

Related Dodge Questions
How do you adjust emergency brake on 2010 ram 2500. Brakes
how do you adjust emergency brake on 2010 ram 2500 … read more
Chad Farhat
Chad Farhat
Owner
Associate Degree
4,000 satisfied customers
Parking brake won't hold dodge grand caravan 2006. Brakes
yes old shoes were worn from draging replaced cables and shoes … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
The battery is fine, towed it to my mechanic and it's not
the battery is fine, towed it to my mechanic and it's not the starter. Bought a new key from Dodge dealership about 2 months ago. All the dash lights come on but the truck won't turn over! … read more
Jaybird61
Jaybird61
Master Automotive Mechanic
1,882 satisfied customers
Brake lights stay on ,no cruise, no remote locks or start.
brake lights stay on ,no cruise , no remote locks or start … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
I was towing a trailer with the electric brakes and
I was towing a trailer with the electric brakes and everything was working fine and now they are not working where can I find the problem? … read more
Lou P. master tech
Lou P. master tech
Mercedes Benz master tech
Bachelor's Degree
649 satisfied customers
Battery keeps dying. 99. No my in law we changed the battery
No my in law we changed the battery 3 times took alternator to autozone said it was good … read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
ABS and brake lights intermittently come on and speedometer
ABS and brake lights intermittently come on and speedometer stops working. Happens over and over again the entire time I'm driving my truck. … read more
garrtim
garrtim
SERVICE MANAGER
1,831 satisfied customers
2000 dodge truck ram 1500 abs brakes need to bleed brakes.
2000 dodge truck ram 1500 abs brakes need to bleed brakes … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
The front brakes lock up I already change the caliper brake
the front brakes lock up I already change the caliper brake pads and it still does the same thing … read more
roy
roy
Associate Degree
3 satisfied customers
DODGE CARAVAN anti-lock brake system - 3EFE Battery Pack
DODGE CARAVAN anti-lock brake system - 3EFE Battery Pack voltage out of range, fuse good … read more
Anthony
Anthony
Master Automobile Technician
Vocational, Technical or Trade Scho
8,789 satisfied customers
2014 dodge pushed brake pedal went to floor, dripping brake
2014 dodge pushed brake pedal went to floor, dripping brake fluid but resovoir still fullish… read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
I want to replace the fuel injector o rings on my 1999 dodge
I want to replace the fuel injector o rings on my 1999 dodge caravan 2.4l. I bought the intake manifold gaskets and the o rings. Wanted to know if I need anything else. … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
What fires the fuel injectors on a 2001 cummins in a dodge?
what fires the fuel injectors on a 2001 cummins in a dodge? I have fuel coming out of the vp44 while cranking.… read more
Robert R
Robert R
Auto Technician
Vocational, Technical or Trade Scho
879 satisfied customers
The battery light comes on. The battery is new the
The battery light comes on. The battery is new the alternator is new and all fuses are good … read more
David Craig
David Craig
OWNER/MECHANIC
Associates
3,912 satisfied customers
Code P2146, P2146 - Fuel Injector Group A, Supply Voltage
P2146 - Fuel Injector Group A, Supply Voltage Circuit Open … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
After cleaning my battery the abs and brake light stay on,
after cleaning my battery the abs and brake light stay on … read more
garrtim
garrtim
SERVICE MANAGER
1,831 satisfied customers
Recently had the fuel injector harness replaced, still
recently had the fuel injector harness replaced, still having problems with jerky, hesitant operation at any level using the foot feed, however it runs perfect out on the highway using the cruise cont… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
No pulse to fuel injectors good fuel pressure to rail,
no pulse to fuel injectors good fuel pressure to rail … read more
Chris
Chris
Shop Foreman
6,613 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x