Really Need help with misfire and more...
06-09-2006, 07:12 PM
#1
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Really Need help with misfire and more... Folks...
I am completely out of ideas. 87k miles on car.
Here are the issues. car info in Sig.
I keep getting P0300 random misfire, gas mileage sucks, stalls when AC is on, idle drops off when sitting in traffic. A few months ago I had car on the dyno and was having a bunch of problems with fuel delivery leaning out bigtime only had 300hp/308TQ with him stopping the run at 5k RPM since A/F was pegged at 15. I checked the fuel pressure with a gauge on the rail and only had 46psi under load (4500RPM) 52psi no load. I changed the fuel pump, replaced the fuel filter, have decent pressure now. About 5 months prior I had a Cam Position Sensor go out, and had to replace it, what a PITA. I didn't do a relearn and am wondering if this could be my problem. After the CPS sensor replacement I had a Taylor wire arc'ing on me, so I changed to factory wires and new plugs, still have the P0300 but also had some O2 codes that then popped up P0420 I think. I tried some GM Top engine cleaner before plug swap, I changed front O2 sensors, cleaned MAF, Chevron Fuel injector cleaner. I am still getting P0300 and now also P0327, P1539 and P1546 (the last two are AC codes though)
How can I clean the injectors without having to send them anywhere or dole out 300 bucks. Its my daily driver too.
How can I check Coil Packs without a DMM/Volt meter
I am so fed up and am out of ideas. I am open to suggestions. Thanks
I am completely out of ideas. 87k miles on car.
Here are the issues. car info in Sig.
I keep getting P0300 random misfire, gas mileage sucks, stalls when AC is on, idle drops off when sitting in traffic. A few months ago I had car on the dyno and was having a bunch of problems with fuel delivery leaning out bigtime only had 300hp/308TQ with him stopping the run at 5k RPM since A/F was pegged at 15. I checked the fuel pressure with a gauge on the rail and only had 46psi under load (4500RPM) 52psi no load. I changed the fuel pump, replaced the fuel filter, have decent pressure now. About 5 months prior I had a Cam Position Sensor go out, and had to replace it, what a PITA. I didn't do a relearn and am wondering if this could be my problem. After the CPS sensor replacement I had a Taylor wire arc'ing on me, so I changed to factory wires and new plugs, still have the P0300 but also had some O2 codes that then popped up P0420 I think. I tried some GM Top engine cleaner before plug swap, I changed front O2 sensors, cleaned MAF, Chevron Fuel injector cleaner. I am still getting P0300 and now also P0327, P1539 and P1546 (the last two are AC codes though)
How can I clean the injectors without having to send them anywhere or dole out 300 bucks. Its my daily driver too.
How can I check Coil Packs without a DMM/Volt meter
I am so fed up and am out of ideas. I am open to suggestions. Thanks
06-09-2006, 10:26 PM
#3
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p0420 Hey buddy, just to let you know, a p0420 code means your convertors are stopped up... that CAN also cause your misfire...you can either pull out your precat 02 sensor and drive it, or do a backpressure test... It really sounds like a clogged cat!!!
Brian
Brian
06-10-2006, 01:53 PM
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there is a tool, it has a guage, with a fitting that screws into the 02 sensor bung... srew the fitting in and there is about a 3 ft hose. you may have to get a buddy to help you... start the car and rev it up to about 3k rpms... If the guage gos above 1 1/2, your cats are plugged... If you got a 420 code instead of a 430, your drivers side is the problem...
let me know
Brian
let me know
Brian