Check engine light with all cylinders misfiring and vsc trac lights on

[V8Man]

I may have been dreaming, I'm trying to go to sleep now. It's my way of counting sheep. I remember a post where the same thing happened and they found the cam timing sensor wire was pinched or cut and shorting out. That little bugger is in a bad place and when you are doing a timing belt change you gotta look where it goes.

 

[DZNUTS]

Personally, it sounds like your mechanic is throwing parts at the problem. What are the code numbers being thrown by the ecu?

If nothing is blocking air flow to your engine bay, your coolant level is sitting at the appropriate level in the reservoir, and the fins on your radiator aren't all kinds of jacked up, I would say you just donated to your mechanic's mortgage payment.


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[Cruiserfanatic]

Personally, it sounds like your mechanic is throwing parts at the problem. What are the code numbers being thrown by the ecu?

If nothing is blocking air flow to your engine bay, your coolant level is sitting at the appropriate level in the reservoir, and the fins on your radiator aren't all kinds of jacked up, I would say you just donated to your mechanic's mortgage payment.


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I also am curious exactly what codes are being set. P0300 alone, or P0301, P0302, P0303, etc. I highly doubt heat has anything to do with this, especially if the vehicle isn't "overheating". I had a 2003 Sequoia that would start to run hot at idle (plugged fins on the radiator), and once I cleaned them, it was fine. It never started to misfire when it was running hot. Running the A/C adds a load to the engine, which a lot of the times, enhances the misfire condition. When I first read this complaint, my initial thought was water in the fuel tank, or bad gas at some point that hasn't been completely used yet. Another thing that I've seen is a dirty throttle body, and after the battery dies or is disconnected, can cause a rough idle. I've never seen it set codes though.

 

[wfa489]

I also am curious exactly what codes are being set. P0300 alone, or P0301, P0302, P0303, etc. I highly doubt heat has anything to do with this, especially if the vehicle isn't "overheating". I had a 2003 Sequoia that would start to run hot at idle (plugged fins on the radiator), and once I cleaned them, it was fine. It never started to misfire when it was running hot. Running the A/C adds a load to the engine, which a lot of the times, enhances the misfire condition. When I first read this complaint, my initial thought was water in the fuel tank, or bad gas at some point that hasn't been completely used yet. Another thing that I've seen is a dirty throttle body, and after the battery dies or is disconnected, can cause a rough idle. I've never seen it set codes though.

Just an update: never found the problem and it's winter now so have not had the issue come up again. I ended up cleaning the throttle body, doing a comp test which came out okay but valve 3 seemed to be slightly out of the limit. Had my timing belt and water pump replaced before going on a 2k mile road trip from California to Seattle. No issues. Going to have to wait till summer to try and find the issue again. I think it is definitely best related due to the fact that I can't replicate the problem in cooler weather.

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[gthoman]

Could this be a timing belt issue and now fixed since it was replaced?? I'm having the same/similar problem with my 4.7 V8, it is getting codes P0300, P0302, P0303, P0305 and P0306. The car has a hard time starting, tries to turn over multiple times, but will eventually start, but if you try to put it in gear, it cuts off?? Was going to open a new thread, but I'm a newbie, so can't. Any help would be greatly appreciated!

 

[wfa489]

I also am curious exactly what codes are being set. P0300 alone, or P0301, P0302, P0303, etc. I highly doubt heat has anything to do with this, especially if the vehicle isn't "overheating". I had a 2003 Sequoia that would start to run hot at idle (plugged fins on the radiator), and once I cleaned them, it was fine. It never started to misfire when it was running hot. Running the A/C adds a load to the engine, which a lot of the times, enhances the misfire condition. When I first read this complaint, my initial thought was water in the fuel tank, or bad gas at some point that hasn't been completely used yet. Another thing that I've seen is a dirty throttle body, and after the battery dies or is disconnected, can cause a rough idle. I've never seen it set codes though.

It sets off P301, P302, P304 etc... All the way up. When I plug in the code reader it always has 2 batches of the codes. I'll have 16 codes, 2 for each cylinder misfire. I think your right in that the AC is putting the extra load on the system and enhancing the problem but it only does it on the really hot days... Above 100 degrees. The engine doesn't overheat at all. Went the whole winter and spring without any problems. Had a triple digit day the other day and it happened again. Same exact thing. I guess I can be thankful it's consistent lol.

 

[wfa489]

Could this be a timing belt issue and now fixed since it was replaced?? I'm having the same/similar problem with my 4.7 V8, it is getting codes P0300, P0302, P0303, P0305 and P0306. The car has a hard time starting, tries to turn over multiple times, but will eventually start, but if you try to put it in gear, it cuts off?? Was going to open a new thread, but I'm a newbie, so can't. Any help would be greatly appreciated!

I had my timing belt replaced and the issue has continued on. I think you may have a different issue, I don't have the issue with starting it or it dying while putting into gear. Did you ever figure it out?

 

[superex87]

It seems to me that the alternator is struggling to output enough power when it's really hot. Or you have a poor connection that's related to the coils/ a/c system. Remember the a/c increases mechanical load and electrical load due to the electromagnetic clutch. That clutch draws a good bit of power. I would locate a wiring schematic and trace out those two circuits and see what they have in common. I would all so get a tool to monitor voltage at all times.

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[MY06T4R]

This is what fixed my misfires

I was dealing with random misfires that came from nowhere, it would come and go. It ended up being bad spark plugs, I had bought some fake denso plugs from amazon almost a year earlier. The gap had opened up between .20-.30 over the .44 it is suppose to be. re-gapped and it fixed it. Then I bought real denso plugs from rock auto. I haven't had any problems since.

 

[ZLJUANN]

Could this be a timing belt issue and now fixed since it was replaced?? I'm having the same/similar problem with my 4.7 V8, it is getting codes P0300, P0302, P0303, P0305 and P0306. The car has a hard time starting, tries to turn over multiple times, but will eventually start, but if you try to put it in gear, it cuts off?? Was going to open a new thread, but I'm a newbie, so can't. Any help would be greatly appreciated!

[MENTION=262938]gthoman[/MENTION] did you ever figure this out. This is exactly what’s happening to my 06 v8. Except there’s no solid check engine light. It blinks and I get pending p0300 for random cylinder misfire and a few other codes. Exact symptoms as you.