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2001 4.3 chevy problem kicking my butt, HELP
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Knarley Darley
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Joined: 22 Apr 2004
Posts: 1247

540238.26 points



PostPosted: Mon Nov 26, 2012 5:39 pm    Post subject: Reply with quote

I still think it is ignition rather than egr. It will idle fine most of the time with a slight occasional miss that I would think would be worse, and constant if it were egr. I will let you know how it progresses, and thanks for all the input. We will get this thing figured out.
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Paul P
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Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Mon Nov 26, 2012 5:42 pm    Post subject: Reply with quote

i had an EGR issue with my 87 TBI truck that was similar. Thing would stick open now and then and idle horribly. WOT was ok of course. It would throw O2 sensor codes and nothing would have told me what was going on except to check it and it was stuck during the run like shit stage.
I did replace the ignition module, MAP, TPS and O2 before finally finding it. Intermittent POS.

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2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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Knarley Darley
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PostPosted: Mon Nov 26, 2012 10:51 pm    Post subject: Reply with quote

Didn't have a lot of time to mess with it today, but when it runs bad, it is at all rpm ranges, WOT doesn't matter, and random pinging like it has a wet dist. cap cross firing.
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10sec.et
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Joined: 29 Mar 2006
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Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Mon Nov 26, 2012 11:58 pm    Post subject: Reply with quote

how old is the battery ? seen a lot of really weird stuff caused by an old (3 years or more) battery. computer grounds ? what about a leaking windshield allowing water into a module or fusebox ? water can still be present for days. you can pull back the carpet and verify if its getting water inside. remember everything uses CAN data. even the ABS module can ruin your day.

i know thats a lot of maybe. im just trying to remember all the stupid sh!t that has made me miserable over the years.

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Knarley Darley
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PostPosted: Tue Nov 27, 2012 1:32 am    Post subject: Reply with quote

I mentioned earlier the computer is literally mounted under the edge of the battery tray, and yes it looks hammered from years of leaking crap on it.
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Knarley Darley
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PostPosted: Tue Nov 27, 2012 10:46 pm    Post subject: Reply with quote

Found it, and stupid, stupid, stupid, wiggle test!!!!! There was a broken wire inside the insulation of the ignition module plug about 6 inches away from the plug. I wondered why the problem seemed less bad when I changed the module, but was still there, so I started fiddeling with stuff in the area, and grabbed the loom going to the coil, and module, which are mounted next to each other on the same bracket, and the engine died. No way, lets see if that was repeatable. Started it back up, grabbed the loom, and it died again. Third time I carefully moved wires one at a time until I found the culprit. Stretched it and it pulled apart, literally broke in half with minimal pressure. The only thing holding the connection was the insulation. Man what a pain this thing has been, and I am glad it is fixed.
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Paul P
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Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Wed Nov 28, 2012 11:44 am    Post subject: Reply with quote

Nice!
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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10sec.et
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Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Thu Nov 29, 2012 12:22 am    Post subject: Reply with quote

I'm not worthy I'm not worthy I'm not worthy I'm not worthy
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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SMOKEmUP
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Joined: 30 May 2002
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65097.54 points


1979 Chevrolet Camaro

PostPosted: Thu Nov 29, 2012 1:54 pm    Post subject: Reply with quote

Glad you found it.

Sounds like the problems I had with my turbo Mustang. It would just die and it turned out the entire harness was junk. All the insulation was cracked and rotted causing miscellaneous problems. That's why I sold the car.

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Stop running from your pain and embrace your pain. Your pain is going to be a part of your prize.

I challenge you to push yourself.
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af2
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1933 Willys Coupe

PostPosted: Thu Nov 29, 2012 5:16 pm    Post subject: Reply with quote

Knarley Darley wrote:
Found it, and stupid, stupid, stupid, wiggle test!!!!! There was a broken wire inside the insulation of the ignition module plug about 6 inches away from the plug. I wondered why the problem seemed less bad when I changed the module, but was still there, so I started fiddeling with stuff in the area, and grabbed the loom going to the coil, and module, which are mounted next to each other on the same bracket, and the engine died. No way, lets see if that was repeatable. Started it back up, grabbed the loom, and it died again. Third time I carefully moved wires one at a time until I found the culprit. Stretched it and it pulled apart, literally broke in half with minimal pressure. The only thing holding the connection was the insulation. Man what a pain this thing has been, and I am glad it is fixed.


B, was that close to a wire loom clamp?
What a deal and glad you found it..
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Knarley Darley
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Joined: 22 Apr 2004
Posts: 1247

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PostPosted: Thu Dec 06, 2012 11:53 pm    Post subject: Reply with quote

Nope it wasn't under a loom clamp. But some one else had tried to find the problem before me, and there were wires pulled out and poked, and they had zip tied the loom to the dip stick tube. They were on the right trail, but gave up before they found it. The thing was seriously neglected, and just needed some basic maintenance. Most places just want to make the easy money, and will not take the time to find the gremlins. This poor lady did not think it would ever be fixed. Again thanks to everyone for your input. Many minds help a lot.
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