I'm stumped
08-01-2015, 11:46 PM
#1
Junior Member
Thread Starter
Join Date: Jul 2015
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
I'm stumped
Car will start idle and die. It is getting 44psI to the fuel rail at idle when I put carb an choke down the intake it used to be where I could unplug the alternator and run fine but it wen back to none at all I'm so lost...
no one knows ��
08-04-2015, 11:03 PM
#3
Supreme Member
iTrader: (3)
Join Date: Jan 2009
Location: Mesquite, Texas
Posts: 4,009
Likes: 0
Received 5 Likes
on
5 Posts
Car: 89 rs, 86 Trans Am
Engine: RS-V6... Trans Am-LG4
Transmission: RS-T5... Trans Am 700r4
Re: I'm stumped
I'm sorry, I read your post several times, but I have no idea what you are trying to say
08-05-2015, 09:34 AM
#4
Supreme Member
iTrader: (1)
Join Date: Sep 2010
Location: Georgetown TX
Posts: 1,928
Likes: 0
Received 0 Likes
on
0 Posts
Car: Base 91 'bird
Engine: 3.1 v6
Transmission: 4L60
Axle/Gears: 9-bolt 3.27 & PBR
Re: I'm stumped
Give details about the engine and more on what happens after starting and the symptoms it shows when it dies. Not sure what the connection is with the alternator.
08-05-2015, 07:05 PM
#5
Junior Member
Thread Starter
Join Date: Jul 2015
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
Re: I'm stumped
Okay I was driving down the highway and the motor shut off I let it sit a few hours and drove it home thinking the issue was vapor lock . went to drive to orilies the car shut off . I had to tow it home. I could keep the car running at 500 rpm with carb and choke . tested the fuel pressure at the fuel rail it was getting 45psi when I had it idling at 500 rpm . then I tested with a diod light to see if the injectors were getting proper signals. They were. I had recently replaced the alternator so I unplugged it to see what it would do and it idled perfect. In any gear. Now it is back to only running with carb and choke in the intake
Trending Topics
08-05-2015, 09:36 PM
#9
Member
iTrader: (2)
Join Date: Jan 2012
Location: New Jersey
Posts: 397
Likes: 0
Received 0 Likes
on
0 Posts
Car: 91 Z28 Coupe
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 2.73
Re: I'm stumped
But anyway... eventhough the injectors are testing good, the problem seems to lie in the fuel delivery.just because the injectors are ohming out properly, does not mean they are spraying properly.
08-06-2015, 08:51 AM
#11
Supreme Member
iTrader: (1)
Join Date: Sep 2010
Location: Georgetown TX
Posts: 1,928
Likes: 0
Received 0 Likes
on
0 Posts
Car: Base 91 'bird
Engine: 3.1 v6
Transmission: 4L60
Axle/Gears: 9-bolt 3.27 & PBR
Re: I'm stumped
You need to test the injector resistance to start with. They should all be close to 13ohms or so. If any aren't then youj need a new set. Also, have you checked/cleaned the idle air control valve etc. etc. By the way, when you get to the injectors to test them also check the fuel pressure relief valve vacuum line for any gas smell. If you smell gas in the line replace the FPR diaphragm. Probably should do it anyway if it's original.
Thread
Thread Starter
Forum
Replies
Last Post