Computer issues??

[kimcrwbr1]

Getting stranded is never a laughing matter. Try disconnecting the battery for 1/2 an hour and see what it does. There is no way to test the computer but resetting it might tell you if it is working, it will reset the values and then as it runs all the inputs may throw it out of wack again maybe a bad sensor engine temp, IAT, Map ect.. Clean all the connectors and intake air temp with electrical cleaner with the battery disconnected. Start it up and if it runs better the computer is likely good and after it runs and if it goes south then bad inputs or bad wiring is suspect. If you change the computer and have the same issues then you probably have two good computers chances are next to zero two computers have the same faults! Look at the wire/s going to the O2 sensor in the exhaust manifold alot of times intermittent faults are related to a wire shorting out part time and will throw the computer waco. GL

 

[kimcrwbr1]

Oh yea replace all the vacuum lines especially if they are hard or cracked or loose fitting.

 

[Spitfire1975]

MAP, IAT, ECT, IAC, O2 and all EGR but DPFE are either brand new or brand new within the last 5000 miles. I have driven this thing very little because of this dang fault issue. The wiring to all the connectors seems good, from what I can tell, not saying an internal break/ corrosion is getting me. EGR vacuum lines have been replaced, but not the lines running to the brake booster and cruise control.

The way it cycles through the running rough periods and then floods out before running good again for a while seems to be pointing towards the computer. I have reset this computer I don't know how many times and it doesn't ever make a difference. Same issue consistently. That and this most recent bout of serious running issues started after a heavy snowstorm and I had a leak where the roof connects to the A-pillar. I had a diaper collecting water that was dripping from under the glove box. I should have tried the computer a while ago.

 

[Spitfire1975]

Oh, by the way, Happy Thanksgiving.

 

[Spitfire1975]

not the computer. So I guess I am back to checking more wiring, the ignition system, etc...

watch... it winds up being a cracked distributor cap....

 

[CurtisP87]

Have you pulled the distributor and checked the stator...? Seems like a bad stator assembly could cause weird misfiring.

 

[Spitfire1975]

Have you pulled the distributor and checked the stator...? Seems like a bad stator assembly could cause weird misfiring.

That and the cap are first on the list. I thought I had changed the stator, but it may have only been on the other truck I had at the time.

 

[CurtisP87]

Sounds like that's the only thing you haven't changed already, hopefully you've zeroed in on the problem!

 

[Spitfire1975]

hopefully!