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Topic
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Hey all,
Have a crank no start situation.
2001 GMC Sonoma
2.2 motor
130kWhile driving down the road a few days ago my Sonoma just died all of a sudden. No noise, no indication of anything prior. Nothing. Decided not to fool with it at the time being and just had it towed home.
The truck had a CEL on for quite some time and using my scan tool it only showed :
P0122
P0144
P0178
P0179
None of which seems to be the culprit.I’ve been quite busy since then and have rented a fuel pressure tester and compression tester (not likely but I’ve seen stranger things). Tried running the fuel pressure tester via the schrader valve however the gauge I rented was apparently broken (after many minutes of heartache thinking my fuel pump was out lol).
So anyway through my minimal testing this far I’ve concluded that there IS fuel in the fuel rail (however not sure if there is sufficient volume/pressure due to the gauge being broken). I have confirmed that there IS spark via a basic spark tester.
Over the next few days I should have quite a bit of time to look into it. Once I get figures for compression test and fuel pressure test I’ll report back.
Any ideas?
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Replies
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Thanks for the speedy reply!
The codes for the O2 sensors have been there for quite some time even after changing them barely a year ago.
I think it’s also worth mentioning that the fuel filter was changed almost a year ago as well using a cheap knock off filter. I say this because apparently the FPR is located in the filter on my model.
How to diagnose the P0144 code?
Checks the electrical connections or wire harness cover to the O2 bank 1 sensor 3 for shorts or sensor damage
Scans codes and documents freeze frame data, then clears codes to verify the sensor failure
Monitors O2 sensor data to see if the voltage is stuck above 500 mV
Checks the exhaust catalyst for damage or if it broke apart in the housing
Follows the manufacturer’s specific pinpoint tests for further diagnosis
As for: [i]I think it’s also worth mentioning that the fuel filter was changed almost a year ago as well using a cheap knock off filter. I say this because apparently the FPR is located in the filter on my model.
[/i]This may also be contributing to your issue(s)
I have a ’98 with the same motor. I’ve heard of people having the timing chain let go. Makes me wonder since it died while driving. Once you do your compression check that will tell you if the valve train is still moving or not.
The Vortec 2200 engine is a pushrod engine with the distributor driven off the camshaft, right? If so, remove the distributor cap and rotate the crankshaft by hand. If the distributor rotor doesn’t turn, the timing chain is gone.
[quote=”Evil-i” post=177040]The Vortec 2200 engine is a pushrod engine with the distributor driven off the camshaft, right? If so, remove the distributor cap and rotate the crankshaft by hand. If the distributor rotor doesn’t turn, the timing chain is gone.[/quote]
No distributor on these, totally electronic ignition. The older ones had a dizzy I think but not sure.
Not the answer your looking for, but another thing to check is you oil pressure switch I found this to be a problem a older 350 in a 94 pickup with similar problem.
Just occurred to me. It’s probably not a failed timing chain. Since you still have spark I think that means the ECU must be getting a signal from the camshaft sensor which means the cam is rotating.
Still a slight possibility that chain is at fault if the tensioner broke (which they are also known to do being so flimsy). The slack could allow the chain to skip a few teeth putting timing too far off to start. I doubt it would be the case but just throwing it out there.
*Edit* – looks like I put my foot in my mouth, from what I’ve been reading it’s the crank sensor that controls spark, the cam sensor controls the injectors.
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