Car

Ask a mechanic online and get answers to your car questions

Ask an Expert,
Get an Answer ASAP!

Thank you in advance... 988 Ford F250 with a 5.8l fuel

Customer Question
I need help. Thank you...
I need help. Thank you in advance...
988 Ford F250 with a 5.8l fuel injected...
1988 Ford F250 with a 5.8l fuel injected engine and 5 speed manual transmission.
Here are the symtoms: truck starts and idles fine when it's normal temps outside. It is a little harder to start when it's really cold and at first idles a little rough. I think this is just the temp outsidebothering it. My main issue is, when I turn on the heater the truck shakes and almost dies it at an idle. I can give it gas and it kinda cleans up but once I let off. It starts to shake and idle is rough again.
I've replaced alternator, battery and cleaned the IAC.... Here is the strange part but I'm sure it's the problem solver. If I remove the drive belt and use the heater. It does not affect the truck at all. There is no ac compressor on truck. It has ps/wp/alt/ap. I'm guessing it's a vacuum line or vacuum controlled part that is my issue. Just not sure which one or where to start.
Submitted: 3 months ago.Category: Car
Show More
Show Less
Ask Your Own Car Question
Answered in 11 minutes by:
4/1/2018
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago
Gene
Gene, Auto Service Technician
Category: Car
Satisfied Customers: 6,576
Experience: ASE Master 28 years experience, Ford Trans Tech/SMT, Toyota, Mitsubishi,Hyundai Tech.
Verified

Hello, and thank you for using Just Answer! My name is***** me a few moments to review your question and Ill do my best to assist you.

Ask Your Own Car Question
Customer reply replied 3 months ago
Thank you Gene.
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago

Hello, for the cold start you can have an issue with the engine coolant temperature sensor not reading correctly and dumping too much fuel, or you have a fuel injector leaking down and it is flooding a cylinder when cold and causing the hard start. The first thing I would do is see if any codes are stored by jumping the diagnostic connector as shown in the attached file and count the check engine light. The running without the belt doesn't make sense unless one of the belt driven parts is hanging up, the air pump is the most common culprit of being seized or dragging but check them all. If any code are stored let me know and we can go over them from there.

Ask Your Own Car Question
Customer reply replied 3 months ago
How do I know when each code reading is done. For instance I got 2 flashes in a row. Then a 5 second pause. Then 2 then long pause then 1.
I'm more concerned about the heater issue. Is there a way to test the ap
Customer reply replied 3 months ago
How can I test the IAC?
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago

The heater issue may be related and this is the first thing you do, if the engine is stalling as I mentioned check the pullies for binding and check to see if any codes stored are pointing to a stalling issue. The codes will repeat when done.

Ask Your Own Car Question
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago

A quick test of the iac is to see if the idle drops or engine goes to stall when you unplug it, but this will set a code when you disconnect it.

Ask Your Own Car Question
Customer reply replied 3 months ago
There is barely a drop at all. Can hardly even notice it. Also when testing with voltmeter it's the same voltage if the heater is on or off.
If I took the belt off should it be harder to turn the AP when heater is on, or same as it it's not.
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago

I would replace the iac valve and retest it, preferably with a ford one, it might cost a little more, but the aftermarket ones can cause issues/made cheaply. the heater shouldnt affect air pump operation at all

Ask Your Own Car Question
Customer reply replied 3 months ago
F=flag
. = Pause. (so one . Would be a short time between flashes 2 would be longer pause)
F. . F.F. . . F. . . F.F. . . F.F
Did this make sense. That was all that it did.
Customer reply replied 3 months ago
F=flash
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago

Sounds like there is a code 21 for the engine coolant temp sensor. Code 22 is for the MAP sensor if it has a MAP sensor. This can cause a stalling under a load as well if there is an issue with the MAP. I would replace the IAC valve, disconnect the battery to clear codes. Operate the vehicle until it gets to normal operating temperature. If it still has an issue, retest for codes. If it resets a code 22, replace the MAP.

Ask Your Own Car Question
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago

code 22 would blink 2 times, pause a second and blink 2 times again. then a longer pause and on to the next code if one is stored.

Ask Your Own Car Question
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago

Do you need more help with this concern?

Ask Your Own Car Question
Customer reply replied 3 months ago
I replaced IAC, no different
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago

Then I would clear and recheck to see if the map sensor is flagging a fault, do you see the rpm drop with the new iac unplugged?

Ask Your Own Car Question
Customer reply replied 3 months ago
What about my throttle body sensor.
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago

Only if it set a tps sensor code, the wiring looks damaged to it or you have a flat spot in the throttle.

Ask Your Own Car Question
Customer reply replied 3 months ago
Is there a way to test AP? Like I said it runs fine without the belt on.
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago

Either it is pushing air or it isnt, thats pretty much how it works. The heater should not affect the air pump. Its not commanding a higher rpm when turning on the heater.

Ask Your Own Car Question
Customer reply replied 3 months ago
Gene I'm going to catch up with you on Monday. Is that ok? Enjoy the holiday,
Auto Mechanic: Gene, Auto Service Technician replied 3 months ago

Absolutely, have a nice Easter.

Ask Your Own Car Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with an auto mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Gene Your Own Question
Gene
Gene
Gene, Auto Service Technician
Category: Car
Satisfied Customers: 6,576
6,576 Satisfied Customers
Experience: ASE Master 28 years experience, Ford Trans Tech/SMT, Toyota, Mitsubishi,Hyundai Tech.

Gene 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 would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry.

Stephanie PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible.

CharlesWalnut Creek, CA

As a single woman, I really appreciate an excellent and affordable opinion.
Thank you Geordie, I will not hesitate to contact justanswer in the future!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

The nearest Volvo dealer is 160 miles away. Best $15 bucks I have spent in a long time!

Paul MCorpus Christi, TX

< Previous | Next >

Meet the Experts:

Chris (aka-Moose)

Chris (aka-Moose)

Technician

1,330 satisfied customers

16 years of experience

Ted G.

Ted G.

ASE Certified Technician

1,754 satisfied customers

20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness

George H.

George H.

ASE Certified Technician

1,560 satisfied customers

ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist

GM Tech (Cam)

GM Tech (Cam)

Auto Service Tech

678 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Amedee

Amedee

Former ASE Master Tech

2,557 satisfied customers

ASE certified tech advanced level specialist. Wisconsin certified emissions state inspector

Jerry

Jerry

Master Mechanic

2,181 satisfied customers

ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager

Richard

Richard

ASE Certified Technician

1,008 satisfied customers

12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes

< Previous | Next >

Related Car Questions
0 2 Intrepid, 2.7 chugs & shakes at a stop. Hesitates when
0 2 Intrepid, 2.7 chugs & shakes at a stop. Hesitates when taking off and now has hard brake pedal(loss of Power assist). … read more
kwiggins29059
kwiggins29059
Associate Degree
219 satisfied customers
Ford Explorer LTD 4.6: , my name is ***** ***** the Pilbara
HI, my name is ***** ***** the Pilbara (outback) in Australia, I have a 2003 Ford Explorer that developed a high idle condition right there in front of myself and my wife while it was sitting idling. … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
1988 suzuki samurai: my carb is loose when idle i shake..leak..gasket
I have an 1988 suzuki samurai and is seems that my carb is loose when idle i shake the filter attatched to the carb and the engine shuts off I don't know id it's a vaccum leak needs a gasket… read more
Scott
Scott
Auto Repair Tech, Mechanical and Body
High School or GED
8 satisfied customers
1988 olds cutlass ciera: shifting..intermittent..the RPMs come..smooth
hi, i have a 1988 olds cutlass ciera 2.8v6 auto trans, after driving, when shifting to park to idle the motor starts to shake, intermittent problem, i'd say 30% of the time after driving and going to … read more
Dodge expert
Dodge expert
ASE MASTER TECH, REPAIR FACILITY OWNER
High School or GED
3,636 satisfied customers
Mazda tribute: rough idle..almost stalling)..driving normally
mazda tribute started extremely rough idle (almost stalling) when making any stop. Did not seem undully rough when driving normally… read more
Mastertech 1
Mastertech 1
Lead Technician
Vocational, Technical or Trade Scho
1,755 satisfied customers
NEON: PLYMOUTH..CAR SHAKES..WARMED..BUT THE ROUGH IDLE STAYS
I HAVE A 2000 PLYMOUTH NEON, WITH 124K..AUTOMATIC.....MORNING START UPS THE CAR SHAKES AND IDLES ROUGH...AFTER WARMED UP THE TICK GOES ALMOST COMPLETELY AWAY,BUT THE ROUGH IDLE STAYS WITH IT....I HAVE… read more
ASEtech
ASEtech
Vocational, Technical or Trade Scho
204 satisfied customers
I own a 2001 Ranger Ex. Cab, 3.0L V-6, stick, 61,000 miles.
I own a 2001 Ranger Ex. Cab, 3.0L V-6, stick, 61,000 miles. Has always started and run well until yesterday. After starting, it ran really rough, almost quit, then zoomed up to about 1500 rpm, then ba… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
1988 isuzu: sitting..i tried to crank it and burned the starter up
i have a 1988 isuzu trooper.it has been sitting for a long time. i tried to crank it and burned the starter up.put new starter on and turned it over and over and i kept patting the accelerator and it … read more
Brian
Brian
Automotive Service Consultant/Technician
Bachelor Degree
780 satisfied customers
1972 ford pinto: XXXXX XXXXX at idle, smoothes..cap..rotor
1972 ford pinto wagon 2.0 ,engine shakes at idle, smoothes out at higher rpm.car has been sitting for 10 years.has new cap, rotor,and wires.can you possibly help?… read more
Davo
Davo
Master Auto Tech/manager of auto shop
Vocational, Technical or Trade Scho
1,644 satisfied customers
1998 Mazda Protege LX: a stop light..rattle..shake..air conditioning
I have a 1998 Mazda Protege LX it has 81,000 i am the original owner and the problem is when you stop at a stop light it starts to rattle and shake idle aggresively and when the air conditioning is on… read more
Steve7654
Steve7654
Service Manager/ Technician
4 satisfied customers
94 Integra with 62000 miles. Its an AT,AC, PS,PB. Recent tune-up.
I have a 94 Integra with 62000 miles. It's an AT,AC, PS,PB. Recent tune-up. Today, it began a very subtle misfire through all speeds. It idles rough, but is able to maintain it's idle of about 750. Th… read more
Kyle N
Kyle N
Automotive Technician
Vocational, Technical or Trade Scho
3 satisfied customers
1989 dodge b250: van, 318,a/t it started stalling..idles..tps,and egr
I have a 1989 dodge b250 van, 318,a/t it started stalling at stops,it idles great at the curbside,but dies out when stopping. i changed the tps,and egr. i am wondering if it could be the charge temp s… read more
Hammer Time
Hammer Time
Mastertech
Vocational, Technical or Trade Scho
2,650 satisfied customers
87 chevy truck: 350 fuel injected engine..first start..it idles..warms
i have an 87 chevy truck with a 350 fuel injected engine. when i first start it in the morning it idles up and down up and down until it warms up.… read more
Michael
Michael
Work Equip. Repair Foreman
Vocational, Technical or Trade Scho
554 satisfied customers
1988 ford f250: engine cranks wont turn..vapor lock..problems related
1988 ford f250 7.5L engine cranks wont turn over, was having vapor lock problems. are problems related? whats causing engine to not turn over?… read more
Michael
Michael
Work Equip. Repair Foreman
Vocational, Technical or Trade Scho
554 satisfied customers
1993 ford aerostar: runs great..die..the fuel filter..spark plugs
I have a 1993 ford aerostar runs great, But every once in a while when your driving it and you go to stop it will die. then you have to wait a little bit to get it started. I changed the fuel filter a… read more
Gene
Gene
Auto Service Technician
6,576 satisfied customers
NEED HELP!!!Vehicle very unusual. idles rough was hard too start.
NEED HELP!!!Vehicle very unusual. idles rough was hard too start. timing chain was very loose and replaced with new gears and chain,starts and runs, but very rough,Motor Shakes vigorusly like plug wir… read more
Gene
Gene
Auto Service Technician
6,576 satisfied customers
1988 ford: it is idling it will go lower in rpms..driven..throttle
1988 ford truck 4.9 engine. it will idle great at times. it will also run great.the problem is that sometimes as it is idling it will go lower in rpms and shake a little and when the truck is being dr… read more
FeedMySheep
FeedMySheep
FeedMySheep
Bachelor Degree
46 satisfied customers
1988 Isuzu Impulse: rough..2000 rpm..Have changed air flow sensor
1988 Isuzu Impulse, when started idle is rough,then starts to oscillate between 900 rpm and 2000 rpm will nota hold idle. Have changed air flow sensor and checked throttle position sensor,any idea wha… read more
Robertgrove
Robertgrove
Owner
High School or GED
2 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