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Back to Eric’s post last month. OBD2 just linked to other vehicles and cannot communicate with 97 sierra. Cannot find any blown fuses, pin16 has 12 volts on OBD2 port. I am with you PCM probably bad.
But, would it still run for a few minutes before it dies? Any videos on checking this or is it a high dollar trial. Should I avoid dealer mechanics? Advice appreciated.Checked fuses replaced relay early on. Cigarette lighter lights up fine. OBDII port is getting juice I believe it said 14. negative drop test said .02 Does voltage drop need to be looked at? Gettting 14+ when running and no load, still dies. I don’t have a ignition tester or fuel pressure gauge available. the belts/tension and pulleys looked good.
Let me run this by you guys, I hear the fuel pump if I turn the key for about 3 sec. This morning and yesterday it ran about 10 minutes then died. So initially it runs longer then on next start ups it doesn’t last as long. That is telling me something is warming up causing it to die. Next the fuel pump, when running has a high pitch noise the whole time. I was listening under the car to the tank and the noise and car ended at the same time. Directly after it dies I turn the key off and back on to see if I hear the fuel pump, no noise, I try to start and just keeps turning over. I let it rest 30 sec and try again the pump makes noise for a couple seconds. I then try and it starts. Maybe lightning arc caused issue with fuel pump sensor or fuel pump? Does the high pitch noise of the F/P sound normal while running? Should the F/P start every time when turning the key to on, or would that cause a flood situation? Maybe I am barking up the wrong tree here.
Excellent, thanks for the videos. I will pick up there and update after I step through them and check it out.
Ok, my dad said the battery was a few months old. Removing this assumption and watching the videos, the volt meter reads 12.0-12.2 and running 14.0(+), turn on everything and it says 13.0(+). So that told me alternator looks ok since it is charging. Pulled battery and cant get a reading above 12.0. Taking it down to get it tested and or replaced. Lets hope it is that easy.
😉took the battery down and had them charge it and put a load on it. It tested good. Got home put the multi meter on it and was 12.7 volts. hooked the battery up and it read 12.58 volts. Tried driving it in the field and of course it died. Connections did look a little worn ( bit of rust, I tried to scratch it out). may need to replace them as they are showing resistance by dropping the volts… Anyone agree 12.58 is too low while hooked to car.
Recap-lightning hit garage, truck wont start, I hear fuel pump startup when turning the key, checked fuses, re-paced relay- noluck, replaced coil and module bingo-Truck now starts. runs a short period of 2-5 minutes and dies. ODBII says cannot communicate. Battery test good. 12.7 on volt meter stand alone, 12.5 while hooked to car. 14 when alternator is charging. Engine is not missing, when it dies it just cuts off. When truck dies generally cannot start unless you wait a 30 sec to a couple of minutes. Idle seems a bit low at ~700RPM it does sound like it will die.
What else could lightning arc have screwed up? fuel Sensor, ECM, distributor & wires? Anyway to test these things by-passing the under dash OBDII port?
Need to logically walk back on this without throwing too much money at it..Ok, not so fast. Truck still stalling. I thought it was fixed cause it lasted longer. Now I see, no change. Another symptom is I have a battery on it a few months old and still dies and needs charging. Alternator check was good too. not sure why this still stalling. Sorry for the late update. Should I reopen through another post?
Sometimes circumstances cloud our judgment and the answer was the simplest in front of us the whole time.
Well done college man! I noticed the (+) connection to the battery terminal moved when wiggling it. Tightened and it ran uninterrupted. I think that gott’er.
Thanks for the replies all!el_crab
Battery tested good.
Just tried it and ran 5 minutes then just died. I was able to start right back up and ran 30 seconds then died. Then won’t start unless waiting a while, no smell of fumes. I hear fuel pump, checked fuse and pump relay.I will clean connections now and make sure they are tight and see if this helps and report back. Thanks.
New OBDII Scanner, hooked up right under the steering wheel tuned to on position and that is when it said cannot communicate. CORRECTION: The only lights are on are Brake light which is due to emergency brake issue and ABS brake light, which started when the lightning hit. Maybe blew out those sensors.