So I was driving my truck today and all of a sudden I felt something was wrong with the truck. It was revving higher than normal so I pulled off a main road to a side road and parked on the side. Shut the truck off, then started it back up. It would idle for a second or two then it would rev up and I wasn't on the pedal. Quickly turned off the engine and it would take a second or two to turn off. I allready tried to clean the carb and I replaced the throttle position sensor and it didn't work. I'm. Scratching my head figuring out what's wrong with my truck. It was acting normal when I first started it up today. And the truck has only 60,000 miles on it.
2005 silverado issue
- Thread starter DirtRacer53
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If your Silverado has a fuel pressure regulator, the diaphragm probably went bad and is pulling fuel from the vacuum line attached to it.
A rough guess but since you are experiencing dieseling there might be fuel in the intake manifold.
A rough guess but since you are experiencing dieseling there might be fuel in the intake manifold.
Originally Posted By: mattd
Is the MIL on?
No it isn't
Is the MIL on?
No it isn't
Originally Posted By: mattd
I'd suggest having someone with a scan tool watch live data while its acting up to see if any sensors are giving incorrect readings.
+1
I'd suggest having someone with a scan tool watch live data while its acting up to see if any sensors are giving incorrect readings.
+1
Originally Posted By: mattd
I'd suggest having someone with a scan tool watch live data while its acting up to see if any sensors are giving incorrect readings.
I don't know anyone that has a scan tool
I'd suggest having someone with a scan tool watch live data while its acting up to see if any sensors are giving incorrect readings.
I don't know anyone that has a scan tool
Check for vacuum leaks by pinching off the brake booster hose, PCV hose etc. A vacuum gauge comes in useful.
I assume you already checked for a binding throttle cable.
I have the same engine in my truck and have not had your problem.
I assume you already checked for a binding throttle cable.
I have the same engine in my truck and have not had your problem.
Without a scan tool I think you're dead in the water. Find a shop. Where it won't shut off when you unkey it makes me think it's more than just one issue--shutdown should turn everything off (ignition and fuel).
Maybe it's just a leaking injector, stuck open or something (dumps lots of fuel in, then it diesels on).
Maybe it's just a leaking injector, stuck open or something (dumps lots of fuel in, then it diesels on).
Do those throttle bodies still use an IAC, because that's what you problem sounds like (stuck IAC)?
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Originally Posted By: supton
Without a scan tool I think you're dead in the water. Find a shop. Where it won't shut off when you unkey it makes me think it's more than just one issue--shutdown should turn everything off (ignition and fuel).
Maybe it's just a leaking injector, stuck open or something (dumps lots of fuel in, then it diesels on).
Engine shuts off when I un key it. Ended up taking it to the shop. Check engine light came on during the drive there.
Without a scan tool I think you're dead in the water. Find a shop. Where it won't shut off when you unkey it makes me think it's more than just one issue--shutdown should turn everything off (ignition and fuel).
Maybe it's just a leaking injector, stuck open or something (dumps lots of fuel in, then it diesels on).
Engine shuts off when I un key it. Ended up taking it to the shop. Check engine light came on during the drive there.
Just heard from the shop. They found that the IAC went out on my truck. Hopefully this was the only thing wrong
Originally Posted By: DirtRacer53
Just heard from the shop. They found that the IAC went out on my truck. Hopefully this was the only thing wrong
Sorry meant to say idle air control motor.
Truck is purring like a kitten now.
Just heard from the shop. They found that the IAC went out on my truck. Hopefully this was the only thing wrong
Sorry meant to say idle air control motor.
Truck is purring like a kitten now.
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