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03-21-2010, 06:15 PM
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#1
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Join Date: May 2005
Location: Dumont
Posts: 231
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TPI HELP
I have a 91 Z28 and it has a rough idle problem and after the car warms up it will not start,eventhough I have spark. After the car cools down it starts fine. It only has a rough idle after it goes into close loop. I have replaced the following items:
oxygen sensor
distributor
spark plugs
spark plug wires
egr
TPS sensor
MAP sensor
cleaned throttle body
I also have a fuel pressure gauge and pressure is holding. I am starting to think it is the ECM since it gives me problems in the closed loop operation. Any ideas would be great.
Thanks Jason
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03-21-2010, 06:42 PM
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#2
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12 Second Club
Join Date: Aug 2004
Location: West Milford
Posts: 8,373
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may be 2 unrelated problems... starter may be getting tooo hot, rough idle could be a ton of things... dirty idle air control motor (IAC), dirty throttle body, a bad plug or wire... start with looking over EVERYTHING really close
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03-21-2010, 07:00 PM
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#3
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Join Date: May 2005
Location: Dumont
Posts: 231
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I cleaned the IAC and throttle body and the spark plug wires are brand new.
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03-21-2010, 09:26 PM
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#4
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Join Date: May 2005
Location: Dumont
Posts: 231
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Quote:
Originally Posted by maroman88
may be 2 unrelated problems... starter may be getting tooo hot, rough idle could be a ton of things... dirty idle air control motor (IAC), dirty throttle body, a bad plug or wire... start with looking over EVERYTHING really close
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I forgot to say the motor cranks but will not start.
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03-21-2010, 09:28 PM
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#5
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Join Date: Feb 2005
Location: west orange nj
Posts: 2,415
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i had the same prob with a 88 gta tpi i changed the ecm,spark plugs ,wires ,cap rotor,coil,iac,o2,all it was was a dirty fuel filter
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03-21-2010, 09:31 PM
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#6
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Join Date: May 2005
Location: Dumont
Posts: 231
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I replaced that also. Thanks
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03-21-2010, 09:32 PM
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#7
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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get a noid light see if the injectors are firing.
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03-22-2010, 09:01 AM
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#8
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Join Date: May 2005
Location: Dumont
Posts: 231
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I was thinking of doing the noid light. Thanks
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03-22-2010, 09:38 AM
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#9
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Join Date: Aug 2007
Location: Long Branch NJ
Posts: 706
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do you have any codes? know what your fuel pressure is? If you havent done so, these are always things you should check before throwing parts at it. I had a similar problem that i traced down to my ECM being bad and it was the distributor having one stripped hold down screw. A
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Formerly known as REED!
JSFBOA
Draino?
Last edited by HeadlessNorseman; 03-22-2010 at 09:40 AM.
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03-22-2010, 03:23 PM
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#10
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Join Date: May 2005
Location: Dumont
Posts: 231
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No it has no codes and , I have a gauge on the fuel rail. There is no gas coming out of the vaccum hose attached to the adjustable regulator so the regulator is good.
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03-22-2010, 03:44 PM
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#11
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Stalker
Join Date: Aug 2004
Posts: 12,082
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when you jump the aldl terminals do you at least get it to flash code 12 to start with?
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03-22-2010, 04:25 PM
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#12
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Join Date: May 2005
Location: Dumont
Posts: 231
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Yes, that is the only code I get.
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03-27-2010, 11:58 PM
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#13
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Join Date: May 2005
Location: Dumont
Posts: 231
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Well, today I ohmed my injectors and 2 are bad. Number 3 injector was only 7.9 and number 4 was 8.0 when it should be 16.0. I ran the car to operating temp. and check the 2 bad injectors, the readings drop to 5.8 when they are hot. I was thinking of replacing them with Racetronix injectors. Any opinions?
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03-28-2010, 01:21 AM
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#14
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Join Date: Aug 2007
Location: Long Branch NJ
Posts: 706
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replace all 8 not just the bad ones
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Formerly known as REED!
JSFBOA
Draino?
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03-28-2010, 03:36 PM
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#15
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Join Date: May 2005
Location: Dumont
Posts: 231
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Yeah, I was not only going to replace the old ones. I am going to replace all 8 since there are 19 yrs old. Has anyone used Racetronix injectors?
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03-28-2010, 04:43 PM
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#16
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Stalker
Join Date: Aug 2004
Posts: 12,082
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i have racetronix ones, no complaints
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