Sputters/Chugging after 80KMH - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 07-20-2004, 06:45 PM   #1
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Default Sputters/Chugging after 80KMH

Thought I would throw this one out for someone to solve, hopefully that is LOL. My first experiences here asking for advice and so on have been very good, alot of knowledgeable people.

The problem at hand here......Car starts up fine, no stalling etc. but is idling rough, cruise along up to 80KMH and after that the car chugs quite heavily. I let off of the gas and press again it disappears, but comes back shortly after.

It'* like the motor is shaking to better explain it , but it'* not stalling or wanting too if this makes any sense LOL.

Your help in this will be appreciated,
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Old 07-20-2004, 07:25 PM   #2
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I had the same problem and what I did to solve mine was change the spark plug wires and the problem went away.

You might also check the coil packs.
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Old 07-20-2004, 08:15 PM   #3
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Mine was spark plug wires. Same symptoms, had it at idle and while accellerating.
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Old 07-20-2004, 08:23 PM   #4
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big_boss thanks for the input , I've changed the plugs and wires a month ago so there new but the coils I've yet to check out.

I own a 94' and would like to know is there a way to check them myself or do I have to take them in to the shop, would like not to take them in though LOL.

Thanks again,
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Old 07-21-2004, 10:53 AM   #5
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How did the plugs look when you changed them? Were they all the same or was there one or two that were different.

The procedure for testing coils, compliments of Willren:

You'll have to remove the coils from the car to test them.

Check resistance between the primary coils. It should be between 0.5 and 0.9 ohms. The secondaries should be between 5k and 8k.

Here'* the pinout for secondaries......on the top (plug wire terminals) read 1-4, 5-2, and 3-6. Easy?

Primaries can be read from underneath.

Note: Test when cold and then test when hot.

Have you had your car tested for codes?
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Old 07-21-2004, 06:11 PM   #6
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Bonnie Canuck hello there......As far as I can remember the old plugs looked a little oily but not major, dirty ofcourse and they all looked equal.

Also thanks a bunch for the coil testing procedure, I'm going to do this ASAP. The last time I had the car checked for codes was about 5 months ago. The mechanic mentioned the following popped up;
Engine Gas Regulator
Throttle Position Sensor
Air Mass Flow Sensor

The only reason I never had him fix these for he wanted to charge an arm and a leg to do this, said he would replace them with used parts and this would have totalled just over $700 CDN.

I found this quite high and never went back, I think I did the right thing LOL, hope I'm not wrong.

I'll LYK what the results were,
Thanks again!!
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Old 07-21-2004, 07:16 PM   #7
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If the tuneup doesn't help, your catalytic converter may be clogged. Symtoms don't discount it at all.
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Old 07-21-2004, 09:36 PM   #8
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Quote:
Originally Posted by BonneMeMN
If the tuneup doesn't help, your catalytic converter may be clogged. Symtoms don't discount it at all.
True there may be a problem with the catalytic converter but that would be the result of improper running of the engine. We have to get to the root of the problem before we replace the converter if there is a problem with it. The usual cause of a damaged converter is due to an engine misfire. The unburned fuel travels down the exhaust into the convertor where it ignites and melts the platinum, pladium and rhodium core. This will clog up the passage and cause excessive exhaust back-pressure and loss of power, especially at highway speeds. The way to determine if you have a clogged cat is to do an exhaust back-pressure test which is done through the hole for the O2 sensor. It requires special tools and a knowledge of how it should look. More of a professional job. I ended up with a damaged cat because of a misfire that I didn't take care of. Another kind of easy way to determine if the cat is severely damaged is to bang it with a rubber mallet (not too hard) and listen for rattling within it (not the exhaust shield). Let us know how you made out with the coil tests.
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Old 07-22-2004, 09:16 PM   #9
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Well I'm back and have a small problem with the testing.....I took eack coil off and tested the resistence and I think I'm doing this wrong but they all read 0.1 OHM'*.

Undrneath each coil are two slots were they connect to the board, I placed each prong from the tester in the slots and it showed the reading.

Correct me if I'm wrong doing it this way, I think I'm doing this all wrong LOL

Thanks,
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Old 07-26-2004, 05:41 PM   #10
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try these links also, they may help. A lot of us have this surging problem, and I dont know anyone that has fixed it yet.

http://www.bonnevilleclub.com/forum/...hlight=surging

http://www.bonnevilleclub.com/forum/...hlight=surging

http://www.bonnevilleclub.com/forum/...hlight=surging
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