King6746 Posted January 15, 2023 Share Posted January 15, 2023 I have recently purchased a 88 Comanche with a blown head gaskets I replaced the gasket installed new lifters and replaced majority of the vacuum lines it cranks up just fine maybe a slight high idle and when I drive it it does fine until I slightly let off the gas then it starts jumping real bad and runs rough I can't just Cruze on it you have to be to the floor or let off completely for it to run fine any idea would be greatly appreciated! Link to comment Share on other sites More sharing options...
Classy Comanche Posted January 15, 2023 Share Posted January 15, 2023 It could be your O2 sensor? I had a issue with high cranks and idles. I had my TPS, IAC and O2 sensor replaced all in one go. And I had my throttle body removed and cleaned. It could be something totally different but it very well could be one of those? Cruiser has some excellent tips and notes that could help you troubleshoot Link to comment Share on other sites More sharing options...
King6746 Posted January 15, 2023 Author Share Posted January 15, 2023 Classy Comanche I will give it a try some more research shows it could be the egr valve also but I wanted a second opinion before I spent $100 on a new one Link to comment Share on other sites More sharing options...
87MJTIM Posted January 15, 2023 Share Posted January 15, 2023 If you have already done so, go to Cruiser54.com and perform the Mostly Renix Tips. Since you most likely unplugged and unhooked all the sensors and hoses, just go back through all the procedures again (and again) to verify you put everything back correctly. If everything is installed correctly, then start testing sensors. Another good website for the Renix sensors is Lunghd.com. Link to comment Share on other sites More sharing options...
Pete M Posted January 15, 2023 Share Posted January 15, 2023 test and verify before replacing. Link to comment Share on other sites More sharing options...
King6746 Posted January 15, 2023 Author Share Posted January 15, 2023 What is a best way to test the egr valve Link to comment Share on other sites More sharing options...
Pete M Posted January 15, 2023 Share Posted January 15, 2023 to the EGR itself? apply vacuum to the port on it. the valve should move. Link to comment Share on other sites More sharing options...
King6746 Posted January 15, 2023 Author Share Posted January 15, 2023 I have tested my egr valve and map sensors they both tested good I pulled my o2 sensor and it is testing bad so I ordered a tps and o2 sensor and also found they my knock sensor is broke Link to comment Share on other sites More sharing options...
cruiser54 Posted January 16, 2023 Share Posted January 16, 2023 www.cruiser54.com. complete Tips 1 through 5. Link to comment Share on other sites More sharing options...
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