PDA

View Full Version : ok sooo... bad news


warnerTA
03-01-2009, 04:32 PM
ok soo i was drivin my car around, just got done with a head gasket replacement, got headers and cai when i replaced all the gaskets, and today i drove it around and it ran really well, then after it has been at opperating temp for a while it just dies randomly? then once it does start it will run and i will be going down the highway at 35 or so and it will all of a sudden lose power and shoot down to 5-600 rpm and then gain power again, but it only does it when it is warm, what do you guys think? optispark? MAF sensor?

thanks guys
KissMyWhtSS
03-01-2009, 04:41 PM
How many miles on the car?

My first bet would be fuel. Get a fuel pressure gauge on the schrader valve behind the intake manifold and see how much fuel your getting. Your fuel pump could be going out and/or your fuel filter could be clogged up.
warnerTA
03-01-2009, 04:47 PM
the fuel filter is relativly new i will check tho, whats a good fuel pump to buy? and it has 145xxx on it
KissMyWhtSS
03-01-2009, 04:51 PM
the fuel filter is relativly new i will check tho, whats a good fuel pump to buy? and it has 145xxx on itMy fuel pump on my '94 Z went out around 139k. Obviously check your fuel pressure before you go out and buy a new pump. I went with a generic autozone pump b/c I knew it wasn't going to be anything more than a bolt-on car and I needed it done cheap.

What are your plans for the car? If your looking to do nitrous, h/c or something that's going to require more fuel I'd suggest upgrading to walbro255
warnerTA
03-01-2009, 04:56 PM
my planes have been met with the car this summer, but next summer the car is going to be a 383:hail: lol, but the check engine light comes on too i forgot to mension that, but i will check the fuel pressure, whats normal pressure? how do you test it?
95greenZ
03-01-2009, 05:12 PM
Have you checked all of your coolant hoses and stuff might have a leak soaking the opti? Especially the damn bleed screws don't ask me how I know. lol
warnerTA
03-01-2009, 05:43 PM
my level has stayed the same and it does not leak any coolant
KissMyWhtSS
03-01-2009, 07:05 PM
my planes have been met with the car this summer, but next summer the car is going to be a 383:hail: lol, but the check engine light comes on too i forgot to mension that, but i will check the fuel pressure, whats normal pressure? how do you test it?I wana say ~44psi at idle. I forget though, it's been ages. Like I said, grab a fuel pressure gauge and hook it onto the schrader valve behind your intake manifold.

Obviously whenever anything is wrong with your car and your throwing a SES light, your first step would be to run up to your local auto parts store and borrow a OBDI/II scanner.
SoulReaver
03-01-2009, 07:12 PM
Sounds like you need to go over your plugs again, or check the 02's. I had a similar issue, and it turned out to be the 02's.
warnerTA
03-02-2009, 12:32 AM
brand new spark plugs, and brand new o2s one side is bouch tho...
Transamman25
03-02-2009, 10:37 AM
fuel pressure is suppose to be 42.5 but it can be within 2% + or -
warnerTA
03-02-2009, 11:57 AM
ok, the bousch might be doing it,?? the bousch o2s?
VendettaV8
03-02-2009, 12:53 PM
ive had o2 issues before and they sounded similar to whats wrong with yours....
warnerTA
03-02-2009, 01:14 PM
ok i am going to replace my o2s one side is bousch and the other side is stock, 145xxx on it
KissMyWhtSS
03-02-2009, 01:24 PM
o2s should throw a code typically.
warnerTA
03-02-2009, 01:31 PM
the check engine light comes on after it happens, sorry i forgot to mention that in the first post
KissMyWhtSS
03-02-2009, 01:44 PM
the check engine light comes on after it happens, sorry i forgot to mention that in the first post
Go down to your local auto parts store and borrow a OBD-I scanner. :cool:
warnerTA
03-02-2009, 01:46 PM
ok lol, i will do that. thanks guys appreciate it!!