1997 K1500 5.7/350 Rough Idle
Posted 09 December 2010 - 02:40 PM
Posted 09 December 2010 - 04:12 PM
Posted 09 December 2010 - 05:32 PM
this could be a function of a faulty Coolant Temperature Sensor (CTS) .. this monitors the coolant temperature in the engine and signals the Powertrain Control Module (PCM) to regulate the flow of fuel to the injector system .. (sort of takes the function of a choke on a carburetor...)
if the CTS is faulty then your engine is going to continue to receive a good rich fuel mix even after the engine warms up ... this is a common problem and very easy to fix
the CTS is located on the top front of your engine right beside the thermostat .. there is a two-pin connector for the wires that connect to it .. you could check the operation of it by measuring the resistance across the two pins on the CTS and this should change dramatically as the engine warms up ... or you could just buy one at a parts shop ($15-$20) and replace it yourself.
.. check the fuel pressure like Steve suggests above... should be within spec of 61 to 66 psi
.. and maybe replace the fuel filter if you can't remember if it has ever been replaced.. (on the frame just behind the driver's side cab)
yes.. the injectors can give you grief, but try the cheaper, easier stuff to fix first....
Edited by Rod R, 10 December 2010 - 01:13 PM.
1997 Chevrolet Cheyenne C2500 xcsb w/ 5.7L Vortec & 4L60E; 3.73 gears w/ G80 (231,000 km)