Chevy

Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

Chevy

95 chevy: TBI..raining..puddle..which made the truck run very rough

Customer Question
'95 Chev c1500 4.3 TBI...
'95 Chev c1500 4.3 TBI, with a 5 speed trans. While raining last week I hit a big water puddle which made the truck run very rough. Now it does run,but, I need to very lightly press the gas to get the rpm's up to about 2000 to to get going, and then when I shift it really misses and stumbles, sometimes backfiring. Then when I get up to 50 mph or so on flat straight road for a short distance, with steady throttle it will start losing power and if I press the gas, just very easy, it will not pick back up. I have so far changed the plugs, none were wet or fouled just dry with a light brown color, plug wires, distributor, rotor, control module. It has a fairly new battery, and I made sure of a tight connection there. I've sprayed carb cleaner around the various vacuum lines with no change.
Thanks for any help...
Jesse
Submitted: 6 years ago.Category: Chevy
Show More
Show Less
Ask Your Own Chevy Question
Answered in 3 minutes by:
12/31/2011
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago
Tim's Auto Repair
Category: Chevy
Satisfied Customers: 16,169
Experience: Have owned a repair shop for 25 yrs.
Verified

hi

sense the problem began after hitting water..the problem may be the ignition coil...the water could have caused the coil to crack,,it may be a hair line crack and may not be able to see it

thanks

Tim's Auto Repair
Category: Chevy
Satisfied Customers: 16,169
Experience: Have owned a repair shop for 25 yrs.
Verified
Tim's Auto Repair and 87 other Chevy Specialists are ready to help you
Ask your own question now
Customer reply replied 6 years ago
Hi, thanks for the answer, and please let me go get a new coil to try. I'll accept the answer and will let you know when it's changed. If (just if) I need more help with this I would like to keep the line open till this is solved ok?
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

yes

that will be fine

thanks

 

Ask Your Own Chevy Question
Customer reply replied 6 years ago
Hi...new coil installed, no change in running. Need more ideas.
Thanks
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

ok

lets unplug the vacuum line from the egr valve....unplug it and put a screw or something in the vacuum line to block the vacuum.....let me know if that makes a difference

Ask Your Own Chevy Question
Customer reply replied 6 years ago
tried but no change. Just to confirm the egr is the round metal frame unit that is by the distributor side of the manifold
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

yes..

ok...does the engine light stay on?if so,,can you give me the trouble codes?

Ask Your Own Chevy Question
Customer reply replied 6 years ago
the check engine light will come on and go off while driving. How do I get the codes to show up?
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

ok

lets do this

1995 Chevy Truck C 1500 Truck 2WD V6-262 4.3L VIN Z TBI
Computers and Control Systems Testing and Inspection, Reading and Clearing Diagnostic Trouble Codes: Reading Diagnostic Trouble Codes, Without Scan Tool
70_gma91cec604-102.pngALDL Connector (Located Underdash)



READING DIAGNOSTIC TROUBLE CODES:
The means of communicating with the control module is the Data Link Connector (DLC) located under the instrument panel and is sometimes covered by a plastic cover labeled "DIAGNOSTIC CONNECTOR." The DLC is used in the assembly plant to receive engine information to determine proper operation before it leaves the plant. The Diagnostic Trouble Codes (DTC's) stored in the control module memory can be displayed by counting the number of flashes of the Malfunction Indicator Lamp (MIL) (Service Engine Soon) when the diagnostic terminal of the DLC is grounded. The DLC terminal "B" (diagnostic terminal) is the second terminal from the right of the DLC top row. The terminal is most easily grounded by connecting it to terminal "A" (internal control module ground), which is located to the right of terminal "B" on the top row of the DLC.

When terminals "A" and "B" have been connected, the ignition switch must be turned to the "ON" position with the engine NOT operating. The MIL (Service Engine Soon) should flash DTC 12 three times consecutively. This would be the following flash sequence: One flash, pause, two flashes, long pause, one flash, pause, two flashes, long pause, one flash, pause, two flashes. DTC 12 indicates that the control module diagnostic system is operating properly. If DTC 12 is NOT indicated, a fault is present within the diagnostic system itself, and should be addressed by consulting the appropriate diagnostic chart.

Following the output of DTC 12, the MIL will indicate any DTC three times consecutively. However if no other codes are present will continue to repeat DTC 12. If more than one diagnostic trouble code has been stored in the control module memory, the DTC's will be displayed from the lowest to the highest with each DTC being displayed three times.

DIAGNOSTIC MODE:
When the diagnostic terminal is grounded with the ignition "ON" and the engine "OFF," the system will enter the diagnostic mode. In this mode, the control module will:

- Display a Diagnostic Trouble Code (DTC) 12 by flashing the Malfunction Indicator Lamp (MIL) "Service Engine Soon" (indicating that the system is operating properly).

- Display any stored DTC's by flashing the Malfunction Indicator Lamp (MIL) "Service Engine Soon." Each DTC will be flashed three times, then DTC will be flashed again.

- Energize all control module controlled relays and solenoids except the fuel pump relay. This allows checking circuits which may be difficult to energize without driving the vehicle and being under particular operating conditions.

- Move the Idle Air Control (IAC) valve to its fully extended position on most models, blocking the idle air passage. This is useful in checking the minimum idle speed.

FIELD SERVICE MODE:
If the diagnostic terminal is grounded with the engine running, the system will enter the "Field Service" mode.

In this mode, the MIL "SERVICE ENGINE SOON" light will indicate whether the system is in OPEN or CLOSED LOOP operation.

If the system is in OPEN LOOP operation, the light will flash approximately two and one-half times per second.

CLOSED LOOP operation is indicated by the light flashing approximately once per second. Also, in "CLOSED LOOP" the light will stay "OFF" most of the time if the system is running lean. It will stay "ON" most of the time if the system is running rich.

While the system is in the "Field Service" mode, new codes cannot be stored in the control module and the "CLOSED LOOP" timer is bypassed.

Ask Your Own Chevy Question
Customer reply replied 6 years ago
it just kept flashing the DCT12 code 1flash pause 2 flash long pause, over and over (more than 3 times)
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

ok

there is no codes stored,,strange........

check the vacuum line to the map sensor,,,make sure it is connected and has a vacuum on it

Ask Your Own Chevy Question
Customer reply replied 6 years ago
that has good vac. that is the one on the passenger side hanging over the valve cover...I also checked the vac on the evap can and that was very slight, does it not need as much vac.?
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

sorry had computer trouble here..

tell me..does it blow any black smoke out the exhaust?

does it do this with the engine cold and hot?

Ask Your Own Chevy Question
Customer reply replied 6 years ago
I haven't noticed any black smoke, and it don't matter if it's cold or warm. Sometimes when I push around on the plug wires and coil wire at the dist., then start it, it will run batter for just a bit then be back where it was. Also I changed the TPS (I know it's not part of the ign. system, but...) and took the exhaust pipe apart between the cat and muffler, and had pressure exhaust there but not so much at the tailpipe end, could the muffler be blocking exhaust to make it do this?
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

well

yes,,a clocgged muffler could cause this,,,but the engine would be really quiet if this is the case...i am thinking your problem may be the pick-up coil inside the distributer,if this is the case,you may just want to replace the complete distributer with a new rebuilt unit,sense the distributer will need to come out and apart to replace the pick-up

thanks

graphic

Ask Your Own Chevy Question
Customer reply replied 6 years ago
OK...one more trip to the parts joint. I'll let you know tomorrow or Monday how it worked...
Thanks
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

ok

you are running out of possibilities here

Ask Your Own Chevy Question
Customer reply replied 6 years ago
OK...got the new dist. in and it runs better, but where is the timing tab at to set timing?
Thanks...
Chevy Mechanic: Tim's Auto Repair, mechanic replied 6 years ago

ok

well.if it isnt broken off..it should be on the timing cover

thanks

 

1995 Chevy Truck C 1500 Truck 2WD V6-262 4.3L VIN Z TBI
Ignition Timing Adjustments: Ignition Timing Adjustment
WARNING: To prevent possible personal injury from a moving vehicle or operating engine, do the following before performing the checks:

^ Engage the parking brake and block the wheels.
^ Place the transmission in neutral.


1. Refer to the Vehicle Emissions Control Information label under the hood. Always follow the Vehicle Emissions Control Information label procedures first before using the following procedure.

2. Put the IC system in the bypass mode by disconnecting the "set timing" connector. This is a single wire sealed connector that has a tan with black stripe lead. This connector breaks out of the wiring harness below the heater case in the passenger compartment.

3. With the ignition switch "OFF," connect the pickup lead of the timing light to the number one spark plug. Use a jumper lead between the wire and plug or an inductive type pickup.

DO NOT pierce the wire or attempt to insert a wire between the boot and the wire. Connect the timing light power leads according to manufacturer's instructions.

4. Start the engine, and aim the timing light at the timing mark. The line on the balancer or pulley will line up at the timing mark. The timing should be O° TDC. If a change is necessary, loosen the distributor hold-down clamp bolt at the base of the distributor. While observing the mark with the timing light, slightly rotate the distributor until the line indicates the correct timing. Tighten the hold-down bolt, and recheck the timing.

5. Turn "OFF" the engine and remove the timing light. Reconnect the number one spark plug wire, if removed.

6. Reconnect the "Set Timing" connector.

Ask Your Own Chevy Question
Ask Tim's Auto Repair Your Own Question
Tim's Auto Repair
Tim's Auto Repair
Tim's Auto Repair, mechanic
Category: Chevy
Satisfied Customers: 16,169
16,169 Satisfied Customers
Experience: Have owned a repair shop for 25 yrs.

Tim's Auto Repair 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 was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money.

Todd LRochester NY

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

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

< Previous | Next >

Meet the Experts:

GM Tech (Cam)

GM Tech (Cam)

Chevy Technician

15,289 satisfied customers

GM Grand Master Technician 2007. 14 years experience.

Gary

Gary

Chevy Technician

9,357 satisfied customers

15 years GM master tech

Tim&#039;s Auto Repair

Tim's Auto Repair

mechanic

16,169 satisfied customers

Have owned a repair shop for 25 yrs.

Dave Nova

Dave Nova

Chevrolet Technician

7,092 satisfied customers

ASE Master Certification. GM World Class Certification

John

John

Master A.S.E Automotive technician

4,071 satisfied customers

A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician

Don - Mo Lurch

Don - Mo Lurch

Auto Mech / Electronics

2,918 satisfied customers

Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.

Ron Z.

Ron Z.

- Chevy Tech -

2,734 satisfied customers

18+yrs experience. State Inspector and Chevy Diagnostics

< Previous | Next >

Related Chevy Questions
2005 impala thought it was a bad cat or muffler but the pep
2005 impala thought it was a bad cat or muffler but the pep boys guy said no both are okay. check engine light is on and he said some o2 warnings came on. they weren't the most knowledgeable guys so t… read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
I already change the spark plugs and wires on a Malibu 2003
I already change the spark plugs and wires on a Malibu 2003 Chevy it won't start … read more
kalamykid
kalamykid
Pactor automotive
Vocational, Technical or Trade Scho
97 satisfied customers
My engine light went on yesterday The code is P0013. Exhaust
My engine light went on yesterday The code is P0013 … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Engine light on" clean exhaust filter continue to dric. Ve
engine light on " clean exhaust filter continue to dric … read more
BOBBYSS
BOBBYSS
TECHNICIAN/ADVISOR
Associate Degree
8,343 satisfied customers
Won't start, get spark from the spark plugs, have put gas in
won't start, get spark from the spark plugs, have put gas in the intact still won't start. Starter is turning all the belts … read more
heavy_chevy_396
heavy_chevy_396
Vocational, Technical or Trade Scho
2,518 satisfied customers
2014 Chevy Silverado 4.3 cylinder two misfire a spark plug
2014 Chevy Silverado 4.3 cylinder two misfire a spark plug is looks like it's wet with gasolineAlso engine code P0106… read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
Pulled spark plug out and fuel came out with the plug.
pulled spark plug out and fuel came out with the plug. … read more
Dan
Dan
Automotive Technician
Vocational, Technical or Trade Scho
25 satisfied customers
Misfire code p0306 I️ changer distributor cap spark plug and
Misfire code p0306 I️ changer distributor cap spark plug and wires new fuel pump don't understand why code is appearing … read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
59 satisfied customers
Misfire in cylinder #1 replaced coil and spark plugs, engine
misfire in cylinder #1 replaced coil and spark plugs, engine light on and flashing. Put in injector cleaner also. … read more
eauto
eauto
self employed
High School or GED
74 satisfied customers
Crank ok but won't start when hot, fuel 55psi,spark plug
when it cold start up no problem,i even replace coolant temp sensor… read more
Michael Solis
Michael Solis
363 satisfied customers
1 cylinder Spark Plugs crack and misfire. Random at first
1 cylinder Spark Plugs crack and misfire JA: How many miles are on the car? Is it a steady misfire? Or random? Customer: Random at first 79000 mjiles JA: What is the model/year of your Chevy? Customer… read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
We have changed the ignition coil and the fuel control
we have changed the ignition coil and the fuel control module and still have no fire. … read more
roy
roy
Associate Degree
3 satisfied customers
Crank, no start. fuel pump is working. spark plugs (I think)
crank, no start. fuel pump is working. spark plugs (I think) are firing. … read more
eric remington
eric remington
FORMER SHOP OWNER/TECHNICIAN/INSPECTOR
associates degree
293 satisfied customers
I'm trying to change the spark-plugs on my 2006 chevy
Hi,I'm trying to change the spark-plugs on my 2006 chevy Malibu,3.5 But I ran into a problem,a couple of the spark-plugs seem to be froze.they don't turn one bit.how can I get them out with out Breaki… read more
Eric
Eric
Auto Technician
589 satisfied customers
Second opinion] I'm trying to change the spark-plugs on my
Second opinion] Hi,I'm trying to change the spark-plugs on my 2006 chevy Malibu,3.5 But I ran into a problem,a couple of the spark-plugs seem to be froze.they don't turn one bit.how can I get them out… read more
Jerry Newton
Jerry Newton
Vocational, Technical or Trade Scho
2,066 satisfied customers
The check engine is on. I have changed all the spark plugs
Hi the check engine is on. I have changed all the spark plugs and core and ignition core. … read more
GM Tech (Cam)
GM Tech (Cam)
Chevy Technician
Vocational, Technical or Trade Scho
15,289 satisfied customers
Changed 1500 ignition coil connector and fuel pump was
changed 1500 ignition coil connector and fuel pump was perfect now dies after 20 sec seems like another wire somewhere is not giving juice to pump … read more
Gary
Gary
Chevy Technician
Vocational, Technical or Trade Scho
9,357 satisfied customers
2009 spark plugs wet engine run rough loss of power. 41k
2009 spark plugs wet engine run rough loss of power. … read more
GM Bob
GM Bob
Automobile Technician
High School or GED
1,002 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