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a gm problem
Posted 01 August 2007 - 06:12 PM
Posted 01 August 2007 - 08:27 PM
Posted 01 August 2007 - 08:35 PM
look for what is common to both sides. removing one injector power from either side smooths it out. This make me think its electrical. Does it matter which plug you pull off. Removing a spark plug wire, does the same thing happen? If not, i would look at the FI electrical, as opposed to a sensor
Posted 01 August 2007 - 08:50 PM
Posted 01 August 2007 - 08:54 PM
Check the injectors when the car is hot to see if they are shorted to ground internally.
A electrical fault may not show up cold.
Posted 01 August 2007 - 08:55 PM
Posted 24 September 2007 - 09:16 PM
Second, the idle speed needs to be correct. 550-575 rpm.
Third, check the TPS voltage. Should be around .50 volt. Check your manual.
Fourth, check the base ignition timing. The computer assumes that the timing is at a certain baseline setting. If it is not, it will not run right. Check your manual on how to do this correctly.
The above must be correct before you start throwing money and parts at it. Do this stuff first.
A classic goof is mixing the wires for the knock sensor and the coolant temperature/fan switch sending unit on the passenger side. The blue wire goes to the knock sensor, the green to the temp/ fan sensor. Reverse these and you'll get a code 42 and/or 43.
Lots of mysterious problems can be traced back to bad batteries, and crappy connections on battery cables. Test the battery, and do voltage drop tests on the cables to see if they are good. If there is corrosion, replace the whole cable instead of cutting the end off and splicing because the corrosion can wick up into the cable.
****All of the preceding information was pulled from a derelict Car Craft magazine sitting on my bathroom floor****
Posted 26 September 2007 - 06:32 PM
Posted 28 September 2007 - 04:01 PM
This car has data streaming, do you have the right scanner for it?
What are the readings for:
Post up the results, I'm thinking the cts is off something else is making the computer richen it up.
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