Rough idle, stalls in idle and while driving

Tiny
ROBERT SMITH3
  • MEMBER
  • 1996 CHEVROLET CAMARO
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 185,000 MILES
First start of day is hard. Definite miss that goes away by feathering pedal then holding between 2000 to 3000 rpm. Will stall in idle, as well park or drive. But will re-fire immediately if put in neutral or park. The engine will cut out during heavy acceleration in a static manner. Running rich. Cannot get a code read. The reader will not even light up when plugged in.
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Wednesday, July 12th, 2017 AT 1:54 PM

15 Replies

Tiny
HEYMAN1104
  • EXPERT
Let's start with the code reader port issue. The OBD2 port gets its power from the same circuit as the cigarette lighter. It should be fuse number eleven in the image below. Check it to see if it's blown, which it probably is. If that fixes it, get the code(s) and get back to us with them.

When was the last time that the car had spark plugs and wires? Given the mileage on the car, it may be time for a tuneup. If that is not the problem, then knowing these cars as well as I do, I can tell you that the miss is probably caused by a weak coil. This car has three coils, each providing the sparks to two cylinders. You will have to check the spark strength on each cylinder individually. See this guide: https://www.2carpros.com/articles/how-to-test-an-ignition-system.

If you have a coil that is not sparking, you can interchange that coil with another one and see if the problem follows that coil.

Let us know what you find.
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Wednesday, July 12th, 2017 AT 2:38 PM
Tiny
ROBERT SMITH3
  • MEMBER
I will check it out and let you know. Thanks.
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Thursday, July 13th, 2017 AT 2:02 AM
Tiny
KEN
  • ADMIN
Please let us know what happens. Heyman1104 is one of our best

Cheers, Ken
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Thursday, July 13th, 2017 AT 3:52 PM
Tiny
HEYMAN1104
  • EXPERT
Okay, great.
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Thursday, July 13th, 2017 AT 5:49 PM
Tiny
ROBERT SMITH3
  • MEMBER
Ok. Fuse was blown. There were three codes, but I just realized the papers they gave me only has one. They tell me probable components for codes 2 and 3, but no code identification.

First code: mass air flow "A" circuit low.P0102
Probable Components: mass airflow sensor, throttle body, throttle body gasket, catalytic converter.

Second code?
Probable components: EGR valve, EGR valve gasket.

Third code:?
Probable components: evap purge solenoid valve, evap vaccum switch.

I don't have a clue when it had it's last tune up. After reading a great many stories of guys throwing money at their Camaro in hopes of fixing it and it didn't work, I'm reluctant to just start replacing parts in hopes it might work.I'm on a VERY limited budget. I know sometimes you just gotta take a shot, but I'm hoping someone will say, "This is the problem", and find out they were right.

I appreciate you guys reading this and taking the time to respond.
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Friday, July 21st, 2017 AT 10:40 PM
Tiny
HEYMAN1104
  • EXPERT
You probably don't need a new MAF sensor, just clean the one that you have. Get some MAF sensor cleaner from the auto parts store, take the sensor out of the vehicle, and spray all around the sensor with the cleaner. Be sure to spray in the same direction that air flows through the sensor, and be sure to spray the sensor filament. Let it dry for a few hours and reinstall it. Also check the air filter and make sure it's clean. Replace if necessary.

You also probably do not need a new EGR valve. You can just take it out and soak the plunger part with Carburetor cleaner. Also spray some in the tube/pipe that goes to the EGR. Let the valve soak for a while (maybe 10 minutes) and then make sure that the plunger moves freely. Use a small screwdriver to scrape out any carbon buildup. Then let it dry a while and put it back in.

The evap system code isn't causing any rough running conditions, just maybe a little lost fuel economy. We can deal with that later.

Let us know what you find.
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Saturday, July 22nd, 2017 AT 3:57 AM
Tiny
ROBERT SMITH3
  • MEMBER
Cleaned MAF prior to posting question. No difference. There is a noise coming from the throttle body. It sounds like something is loose. The sound is very similar to a water pump going bad. I have no idea how to categorize it other than that. Will do the EGR this evening.
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Monday, July 24th, 2017 AT 3:06 PM
Tiny
HEYMAN1104
  • EXPERT
Ok let us know what you find.
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Monday, July 24th, 2017 AT 6:50 PM
Tiny
ROBERT SMITH3
  • MEMBER
Checked for vaccum leaks using CRC throttle body cleaner. Sprayed all around intake manifold, vaccum hoses, and sensors hooked to throttle body. I found nothing.
Picked up new throttle body gasket. Pulled everything off and cleaned thoroughly.
Idle steadied for a bit, and now jumps around a bit. Not stalling as often. What's odd is that at times the engine, under acceleration, will stutter, as described before. But other times runs perfect. Full power, smooth, even acceleration. I don't get it.
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Friday, July 28th, 2017 AT 11:32 AM
Tiny
ROBERT SMITH3
  • MEMBER
Going to look into the coil suggestion you made earlier. Pick up some plugs and wires as well. Is there a way to test thsee things at an auto parts store, or multi-meter? I've never used one but pretty sure I could figure it out.
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Friday, July 28th, 2017 AT 11:41 AM
Tiny
HEYMAN1104
  • EXPERT
There really isn't a way to test them with a multimeter or scanner, but if you can get a spark tester, that'll tell you something. You'll have to test each cylinder and see watch them closely to see if (1) a spark is weaker on one or more cylinders or (2) if certain cylinders just aren't getting sparks as often. You can also pull the spark plugs and look at them to judge their condition.

You would think that bad plugs and/or wires would throw a misfire code, but that doesn't always happen.

Here's a guide on spark plugs: https://www.2carpros.com/articles/how-to-change-spark-plugs

Here's a link to the spark tester that I use: https://www.amazon.com/Lisle-20610-Inline-Spark-Tester/dp/B0002STSC6/ref=sr_1_3?ie=UTF8&qid=1501325755&sr=8-3&keywords=spark+tester
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Saturday, July 29th, 2017 AT 3:58 AM
Tiny
ROBERT SMITH3
  • MEMBER
Why does this site erase any of my writing before sending if I move my phone even a little bit?
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Thursday, August 3rd, 2017 AT 4:51 PM
Tiny
ROBERT SMITH3
  • MEMBER
Is there any way I can send an image to you guys without using this particular forum? The only way I can send an image is by going through a photo resizer application on my phone. This site will only let me do it directly from my camera and then rejects the image as being too large.
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Thursday, August 3rd, 2017 AT 4:56 PM
Tiny
ROBERT SMITH3
  • MEMBER
I haven't yet looked into the spark issue but I found something new. I noticed my cooling fans weren't working check the fuse box to find that the air pump relay is missing. Later that day I remove my center console to find two relays that appeared to have been wired in, what reason is beyond me. It is apparent that they don't belong there. I can't send you a photo because it says file size exceeds limit. I'm not sure how to approach this or even how to research it. Can you give me some advice please? If it's possible for you to email me please do so at slick Willy 959 at gmail. Com, slick Willy is all one word with a y. Slickwilly959@gmail. Com.
Thank you.
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Thursday, August 3rd, 2017 AT 5:07 PM
Tiny
HEYMAN1104
  • EXPERT
The cooling fans aren't going to always run. They'll only run when the engine has warmed up some. One of them will probably only run when the AC is on.

In my experience, usually extraneous wiring on a used car is part of a sound system that a previous owner had. So the stuff under the console may well just be that. There may be more wires sticking out in the trunk or in the door jams under the plastic pieces. Poke around in the trunk and under the hood and you'll probably find what they go to.

As far as the phone/posting issue, I don't have that problem with my phone. Could be a browser issue. I use Firefox on android.

I'll email you shortly with 2carpros in the subject line
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Thursday, August 3rd, 2017 AT 6:23 PM

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