Rough Idle Excessive cranking to start GMC Sierra 2002

When did this problem start? Did you go out to start the truck and it just wouldn't start? Did it die on you going down the road? What did it do before you replaced the fuel pump?

I have seen some of these that have the injectors just dumping major amounts of fuel. Check the oil and see if it smell like it is full of fuel.

Those tests that the PCM runs through haven't ran because the perimiters that are required have not been met. It dosen't mean that those sensors or curcuits are your problem.

Cly

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Residual Fuel Pressure Test: As recommended by Kin Chan

When the pump is turned off or stops running, the system should hold residual pressure for several minutes (look up the specs to see how much pressure drop is allowed over a given period of time). If pressure drops quickly, the vehicle may have a leaky fuel line, a leaky fuel pump check valve, a leaky fuel pressure regulator or one or more leaky fuel injectors. Low residual fuel pressure can cause hard starting and vapor lock during hot weather.

Also check the coolant temperature sensor. This one here is like the choke on a carb.

Were did the truck sit? Outside in the weather or in a climate controled area?

Is it possable that the fuel quality has deteareated over that time?

Maybe it has goten some water in it?

Could it be that a varmint has been chewing on some wires somewhere?

Have you tried to spray carb clearner into the intake while someone starts the truck and see if it runs while the spray is being introduced into the intake?

Problems like these are hard to solve over the internet.I will try my best to help you.

Cly

OutHoo-

You end your first post with “Thank you for any suggestions or input”. Did you really mean that?
Obviously not. Do you realize how many posts go unanswered because of the shear volume we get? I assure you we don’t get rich. On average, I earn less than a few dollars an hour from donations. Essentially it pays for my Internet costs and a chance to reward my wife with dinner for putting up with the ridiculous time I spend helping other folks. Yeah it is still a source of motivation, but not the biggest. I get pure satisfaction when I solve someone else’s problem... Over the net... When a shop couldn’t do it... That has the tools and cars at their disposal. Their (the proper spelling in this context) appreciation is a driving force. I also have the opportunity to learn here, from other contributors such as the ones that tried to help but you so arrogantly dispatched. You weren’t looking for any “suggestions or input” were you? You were looking for the magic bullet that would solve your problem, weren’t you? You chose to replace all of your 02 sensors instead of working with these guys that were willing to help.I hope you blasted those folks also. Who were those folks anyways?

I answer the non-donation posts more often than the donations posts. Yes they get priority when I feel I can help.

I find it rather amusing how some folks such as yourself feel that you have the right to be able to abuse anyone in your path should you choose to. You expect “helpful and courteous” treatment, but dish out quite the opposite. In the auto repair industry as in other businesses we perform a technique called “Weeding”. There is NO need to have to put up with folks that display your kind of abusive antics. Like the hard work that goes into a garden, bad weeds like you are plucked out and banished. You are clearly a time waster, stealing precious time away from folks that are willing to work through their problems with us instead of interacting.
In closing, please do tell everyone about our site. I find anyone with a little intelligence will consider the sources when listening to another speak. People don’t like to confront a raging bull such as yourself, but I guarantee you that they have an opinion that does not coincide with yours. Your blabbering ironically will serve to promote our site. Ironic huh?

I love the reply Service Writer. I couldn't have said it any better myself.

Only thing I can say to outhoo now is.

Thanks for stop'in by.

Cly

Idle sensor?

Idle sensor?

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Eeneymineminneymo-!!!!!!!! Valve or Sensor