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Old 09-25-2007, 09:44 AM   #1
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Default Chugging at 1500 and 2000 RPM under load

Yes i know there are other posts about this but non seems to have addressed the problem.

I ran an experiment yesterday and monitored the RPM'* and the fuel insterment number using the on board computer (Vehicle Data). When driving. the car it typically at 9 inst when crusing at 80KM, then when you go up a hill of have a load it will stay consatant or jump to 11 inst or so.

When the car begins to chug or surge is when we are at similar speeds as above under load and then the car jumps to 16 INST and up then the car crusing is at 13 ist or so.

I heard of a control module that may be acting up. WHat is it called and could this be the problem.

My feeling is the car is getting too much gas and is chugging. THe other problem may be fuel injectors being cloged or a bad fuel pump.

I have changed the fuel filter, spark plug and wires, replace a bad coil (arching) and air filters. It seemed to be good for a while but seems to be worse in hot weather.

ANy takers on the problem or a fix.

THanks
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Old 09-26-2007, 09:36 AM   #2
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Well I was on my way home last night and it happened again (LOTS). It seems to happen when the car is under load and needs to drop a gear. It tends to happen around the 80 kms mark and 1500 RPMs.

Could this be Transmission, or fuel injectors, or a vacume problem or a gas peddel connection.

It doesn't seem to happen at any other speeds. I do notice an odd sound like a missing from the engine at times when taking off in the morning but there is no hesitation.

HELP PLEASE!!!!
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Old 09-26-2007, 10:00 AM   #3
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If it'* only bogging..then it'* probably trying to stay in the higher gear. If you give it a bit more throttle does it downshift?
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Old 09-26-2007, 11:18 AM   #4
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Start by cleaning up all the battery connections, both ends, under the back seat and also under the hood. Pay close attention to the grounding strap where it attaches to the floor pan.

It could also be the fuel injectors, per this recent TSB
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Old 09-26-2007, 12:07 PM   #5
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Default Downshift

Hey, Yes it is better once I give it gas to 'jump' it into gear again. I see the thread about the fuel injectors. Thanks for the link.

Can the average person clean them or do I have to take it to the garage?
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Old 09-26-2007, 07:13 PM   #6
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You could try some injector cleaner, or the GM fuel system cleaner, but those do a better job of cleaning the tank than the injectors. It certainly could hurt. You could also remove the injectors, and soak them overnight in some cleaner. And as mentioned in the TSB, you may want to start using some of the "top tier" gasolines. For a good, thorough cleaning, the best is going with the pros, who disconnect the fuel rail and connect it to a machine to clean them out.
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Old 09-29-2007, 12:51 AM   #7
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Make sure that the rear spark plug wire is not contacting the O2 wiring or sensor.
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