i have been putting together my recovered theft 98 db8 for a while now. it has a obd1 ls in it. i been runnning it on an auto p75 ecu. the motor ran fine, but threw a code for auto tranny comp. i needed to go get a new inspection sticker so i swaped in my sister p2e dx ecu. i ran it for about 40 highway miles to work. it seemed kinda jerky. then when i came out of work the car wouldent idle. to keep it runnnig i had to tighten up the throttle cable a little. i couldent get the idle screw on the throttle body to move. anywas in my way home i hit some traffic. the motor was racing too much and i smelt some plastic burning. i pulled over and turned down the throttle cable. now the car just runs like ****. it sounds like a subaru. i def have a miss somewhere. i pulled the spark plags out and there was oil on them on the threads, but not on the bottom where the compression chamber is. i compression checked the motor and the first and second cylenders i got 130. then the third i got zero. then the fourth was 130 but then went to zero. so i went back to the 3rd and it went from 0 to 130.

what can cause a loss in compression to switch from one cylender to another. i got my b16 head ready to go on anyways, just hoping i dident ruin the block

 

sounds like you might have a bent som valves its ok to drrive in on the dx ecu. pour a cap full of oil in the cyl. if you compression gets better then rings are bad it it stays the same then the head is the issue

 

congratulations u just blew your engine

 

I'm guessing you ran it lean, now your rings are bad or you may have burnt some exhaust valves. A compression and leakdown test should be performed by a mechanic or a competent individual to properly diagnose the issue(s). Good luck.

 

im going with the burned exhaust valve guess

 

well i am not getting any smoke out the exhaust and there is no oil leaking into the compression champer. i am going to try to find a leak down tester.

 

i been tinkering with it a little and still not 100 percent sure what the problem is. i though maybe my cat was colgged. when i drive it feels like the motor cant breath. i unhooked my exhaust but it was so loud i couldent tell anything. i did few compression test yesterday and i got 190psi across the board each time. the engine dosent overheat but it seem like the engine bay temperatures are extreemly high.

 

a plugged cat can do this. had it happen to a car before. you can always start the car open header and test it.

 

yes thats the problem its so loud that i cant tell if its reving right or not

 

a month later i find out it was just a broken injector wire

 

good luck with ya ride man