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engine and exhaust problems


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dragonfly7039
New User

Apr 3, 2014, 11:22 AM

Post #1 of 3 (1034 views)
engine and exhaust problems Sign In

i have a 93 olds cutlass ciera s with a 3.3 it has a 106,000o miles on it. car symptoms, runs and drives like new when cold. after heating up car looses power, let off acellerator, car regains power. now having starting problems when hot. but it doesnt show any codes and is not overheating. first thuoght was fuel problems, have replaced many things.( no catalitic converter took that off sounded like it was chocking, also backfires, fixed it for 2 wks, then same prob. motor surges and looses power. have replaced all fuel filters, maf sensor, oxygen , has new filters. fuel. recient tune up. prem for gas. car drives good then looses power then regains then looses again, then looses it untill completely cooling off. after replacing oxy, sensor car would restart when hot now will not start after warming up.HELP.

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kev2
Veteran
kev2 profile image

Apr 3, 2014, 12:03 PM

Post #2 of 3 (1013 views)
Re: engine and exhaust problems Sign In

you will need to get a cat converter -

start with basics
is there spark at several plugs?
fuel pressure - the pressure drop wwith engine off key on. sometimes easier said than done - need help?
do a vacuum check - record vacuum and observe reading as issue develops.
Disable for testing only the EGR valve.
ALSO for testing - unplug MAF - let us know if better..

this is a 93 that is OBD1 lets confirm its operating - try to get codes theCEL will flash 12 as a test.
do you need instructions?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 3, 2014, 12:11 PM

Post #3 of 3 (1008 views)
Re: engine and exhaust problems Sign In

If it's dieing when loaded and backfiring you might want to try a coil.



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