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Old 06-19-2016, 09:53 PM   #1
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2001 8.1 hesitates and stutters on acceleration

Within the last two camping trips my 2001 Chevy 8.1 Vortec has begun to miss or hesitate during acceleration. I had one mechanic diagnose as #3 plug wire so new wires installed. No change
Second shop I stop at diagnosed as ignition coil pack #3 bad and #1 not far behind. Replaced both. No change.
It would be nice to find an accurate diagnosis but it acts like a fuel starve to me but I'm no mechanic. Replaced fuel filter but again no change.
My next move will be to have injectors ohm check and fuel pump pressure check (performed three years ago)

Any ideas always welcome or a good mechanic around Evansville Indiana area. I am will to drive some miles to get good mechanic and not another parts changer.

Thanks
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Old 06-19-2016, 09:58 PM   #2
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Quote:
Originally Posted by ROAquaman View Post
Within the last two camping trips my 2001 Chevy 8.1 Vortec has begun to miss or hesitate during acceleration. I had one mechanic diagnose as #3 plug wire so new wires installed. No change
Second shop I stop at diagnosed as ignition coil pack #3 bad and #1 not far behind. Replaced both. No change.
It would be nice to find an accurate diagnosis but it acts like a fuel starve to me but I'm no mechanic. Replaced fuel filter but again no change.
My next move will be to have injectors ohm check and fuel pump pressure check (performed three years ago)

Any ideas always welcome or a good mechanic around Evansville Indiana area. I am will to drive some miles to get good mechanic and not another parts changer.

Thanks
If you think it acts like a fuel starve issue, check the fuel pressure, there is a Schrader valve on the fuel line, that you can connect a gauge to, you can get a gauge from autozone or oriellys, I am surprised the other "mechanics" did not do this, as it is a matter of minutes to check this.


Is the check engine light on?


Just for curiosity sakes, how many miles on the 8.1
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Old 06-19-2016, 11:21 PM   #3
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I hope they at least changed the spark plugs if they did all that....

If not...do that.
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Old 06-20-2016, 12:12 AM   #4
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Have you replaced all the plugs and wires? That cured my hesitation on acceleration problem.

Another long shot is cleaning the MAF sensor although that will cause loss of power and usually a Check Engine light.
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Old 06-20-2016, 06:12 AM   #5
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39,000 miles on the 8.1.
Plugs were changed four years ago and I changed plug wires per mechanic four days ago. I do not have a check engine light coming on but I did have a knock sensor code come in back in May with check engine light. Check engine light went out on its own. Checked with code reader.
I will pick up gauge and test fuel line pressure next. Will I need to put a load on engine to get accurate pressure information since engine issue is under load?
I could pull plug #3 and check it also or just replace all to eliminate.
I may replace MAF also.

Thanks
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Old 06-20-2016, 06:27 AM   #6
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I hope they at least changed the spark plugs if they did all that....

If not...do that.
Had the same problem last year on my Ford 460. Did everything you've done so far. Then I found a plug that was buried behind a motor mount. It was a booger to get out, but found a hairline crack in the insulator. I'm betting your issue is a spark plug.
It doesn't happen often but through heat, and vibration in the course of normal use, it's possible to damage the core of a plug just enough to make it short. It's a cheap fix and sounds like you've done everything else.
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Old 06-20-2016, 12:38 PM   #7
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Quote:
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39,000 miles on the 8.1.
Plugs were changed four years ago and I changed plug wires per mechanic four days ago. I do not have a check engine light coming on but I did have a knock sensor code come in back in May with check engine light. Check engine light went out on its own. Checked with code reader.
I will pick up gauge and test fuel line pressure next. Will I need to put a load on engine to get accurate pressure information since engine issue is under load?
I could pull plug #3 and check it also or just replace all to eliminate.
I may replace MAF also.

Thanks
When you changed plugs....did you use the same OEM plug that was in it or an after market plug? I learned the hard way to always use whatever the vehicle manufacturer used when it comes to electrical components.
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Old 06-20-2016, 02:25 PM   #8
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Obviously the filter but some of the earlier coaches had the fuel return from the motor rather than the filter. Under load this can heat the fuel and cause vapor issues. Not sure that is your issue but might be worth investigating.
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Old 06-20-2016, 03:10 PM   #9
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I used Champion plugs so aftermarket.

I did change fuel filter four days ago
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Old 06-20-2016, 03:26 PM   #10
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I see that AC Delco 41-993 are noted and gapped at 0.045.

Anyone have GM PN for MAF sensor?
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Old 06-20-2016, 04:06 PM   #11
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Keep us updated on what finally cures the problem.
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Old 06-20-2016, 06:21 PM   #12
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Old 06-20-2016, 08:34 PM   #13
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Definitely get some AC Delco plugs in there...8.1's don't like other brands
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Old 06-20-2016, 08:45 PM   #14
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If there really was an issue with the plug wire, the plugs should have been changed. A misfire can damage a plug and even though you fixed the root cause you did not fix all of the failed part. I would also stick to AC Delco plugs. OEM is best. Champion plugs are good for lawnmowers and harleys. NGK plugs are good but I stick with oem. Fuel pressure could cause you issues, an injector maybe but that just is not that common at all. Coils maybe, but you want to diag a suspect cylinder, swap those parts with another cylinder. It should follow. If not, look elsewhere.
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