S-10 & Blazer1982-2005
The S-10 and Blazer was arguably the most versatile and accessorizable mid-size truck and SUV on the market.
Platform: S/T-series & GMT 330
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I'm new to this forum have been trying to solve a rough idle issue for some time here is a list of things that have been done hopefully someone can help me, I've posted on another forum with some help but here is my summary
I replaced my spider injector unit today
, But the new unit did not solve my Po301 problem misfire cylinder #1 symptom is (Rough Idle) Here is a list of all the stuff I have done to try and resolve this issue. If there is something You think I might have missed please let me know.
High Voltage ignition switch (distributor) includes new cap & rotor
Coil, Plugs, Wires.
Throttle Position sensor, Idle Air Control sensor, O2 sensors, Egr Valve with screened gasket, Coolant Temp sensor. Checked Voltage at each connector as well all are at recommended voltages
within the last 2 months have replaced the Muffler and Cat Converter
New Muffler, Cat Converter
conducted a compression check on cylinder #1 compared to cylinder #5 both the same
while truck was running i applied pressure in each direction to see if a valve guide was worn but no results,
Components I have not changed
Ignition control Module. From what I understand this either works or doesn't work found some post one other sites where it could possible cause my symptom
I'm kind of ready to throw in the towel Only thing I haven't done yet is a cylinder leak down test. If you have any suggestions please give them to me
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Ran all new vacuum lines seafoamed it and fue pressure holds at 60lbs not running 57lbs running, was wondering if a tired ICM might be the culprit
No stalling issues infact the truck runs better than ever with all the component replacements i've done except at idle, any other suggestions would be great
Ignition control module usually just goes out. Try tapping it with a screwdirver well its running and see if it sputters but I would not think that this would be the culprit. Did you try fuel filter? Whats your compression run all around?
1995 Chevy K1500 355 5 speed manual 4:56 gears 35"tires
2005 pontiac G6 V6 four door sedan
Changed the Fuel filter about a month ago, the fram one I had in it completely
failed inside was like a rattle but will put another one on. I did a compression test on cylinder #1 and #5 for comparison it was just a little over 120lbs
When you changed the TPS did you test the voltage and adjust the idle and wide open throttle signal?
Yes I had it hooked up to a tech 2 scanner and closed throttle and WOT were within the specified voltages, I'm gonna replace the IAC, MAP, and ICM
and if that does not solve it gonna have to consult the pro's on this one
Spent today looking for vacuum leaks and gasket leakes but no luck!!