tbi problems

cardudenc

cardudenc

jeep a holic, resident assho;e
Joined
Sep 21, 2007
Location
morganton
I have a 92 blazer just dropped a motor in. It cranks and runs great cold. but when the temp. starts to warm it starts loading up and foulining plugs. any ideas?
I may just put a carb on it and forget about it.
 
SOunds like temp sensor. My sensor went bad on my tbi and it just kept sending fuel because it was read the engine cold all the time. Mine had 2 seperate sensors one for the gauge a nd one for the ecm. It might be a shot in the dark but I'd check there first.
 
yes, I thought that too. I guess I should have put what I have tried. I have tried 3 temp sensors, just in case got a bad 1. replaced the ecm, changed the throttle body off a running truck. still same issue.
 
you havn't mentioned any error codes. but what does it idle at? is it doing this when it tries to idle down ? how many mins after start up? is the idle speed fluctuating when it does this ?

first check your grounds, on the block, even try running a temp ground from the bat to the block, this can cause a ton of issues but is the easiest to check and fix.

sounds like your having an issue once it warms up and tries to) into closed loop. My guess would be bad vac. line to the MAP sensor or in that run (or possibly bad sensor), bad O2 sensor,

92 = OBD1 grab a laptop and a $30 cable and download (free) winaldl and to some basic datalogging (monitoring) it will tell ya what the sensors are doing.
 
where do i get the cable? a friend has a scan tool but it just locks up when hooked to the blazer. I think I replaced all the grounds, but I will check them again. I will recheck vac. lines. have also tried a different map sensor.
 
cardudenc said:
where do i get the cable? a friend has a scan tool but it just locks up when hooked to the blazer. I think I replaced all the grounds, but I will check them again. I will recheck vac. lines. have also tried a different map sensor.
Click to expand...

Do a little manual googling....the cable can be ordered from numerous online sources for ~$50 but you can amke yoru own at radio shak for under $10.

My pricing may be off as I did mine 3 years ago.
 
BTW IH8MUD has a nice gm tbi info post as does binder bulletin.

And of course an epic on Pirate...
 
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