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i will check out ground diagram is it neccasary to check all the injector wires as if one isnt firing it would still get gas and start but miss on that cylinder as testing is only testing the wire for power and firing not the injector itself
Old 08-02-2013, 12:30 PM
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i checked out ground diagram for early model 28s making note of the engine and infector ground on the motor that the poster made special note of at bottom of diagram. as i said before i am a chef not a mechanic although getting better as time goes on so i appreciate all the help and advice
Old 08-02-2013, 12:52 PM
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This may not be that helpful but, don't give up. These cars are worth it.
Old 08-02-2013, 05:58 PM
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Please verify what fuel injector relay part # you replaced the original with and the position in the central fuse panel that you placed it. Just to be sure.
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Black 1989 GT (The GT) and Cobalt Blue 1989 S4 AT (The Blue Car)
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Old 08-03-2013, 10:13 PM
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i followed the relay diagram that i have and went to autozone with old relay and they gave me a replacement relay they said is a suitable replacement has correct pins and power parameters
Old 08-04-2013, 05:52 AM
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Quote:
Originally Posted by 81headache View Post
i followed the relay diagram that i have and went to autozone with old relay and they gave me a replacement relay they said is a suitable replacement has correct pins and power parameters
Are you sure it's correct? According to this chart. The FI Relay is not like any other relay in your CE Panel. I would have went OEM as it's only $13

https://www.928gt.com/t-81fuse.aspx
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Old 08-04-2013, 06:02 AM
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The relay you need is 928.615.119.00
It is located in the fourth slot from the right on the top.
No other relay will work in this position.
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Grand Prix White 1994 GTS AT (The GTS)
Black 1989 GT (The GT) and Cobalt Blue 1989 S4 AT (The Blue Car)
Indishrot 1984 Euro S AT (The Stepson) and Black Metallic 1984 Euro S 5 speed (The Schwartz)
Old 08-04-2013, 10:00 AM
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that is definatly the one replaced i found the ground on top of cam cover looks rusty and corroded gonna take off and clean up tomorrow as well as look for the one underneath which appears to be a task to get to again thanks any anything else to check i will do i'm very motivated to drive this car its been over ten years since i drove it
Old 08-04-2013, 10:22 AM
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ok checked the grounds for engine and fuel injection system they appear to be grounded well but still not firing the injectors i checked another injector on otherside of motor and no lights over there either so whats next what controls the pulse sent to injectors eventually we will find the culprit.
Old 08-05-2013, 09:13 AM
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i also ordered oem fi relay just in case
Old 08-05-2013, 09:40 AM
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Quote:
Originally Posted by 81headache View Post
i also ordered oem fi relay just in case
Good move.
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John Curry (Drift King) 928OC member
Grand Prix White 1994 GTS AT (The GTS)
Black 1989 GT (The GT) and Cobalt Blue 1989 S4 AT (The Blue Car)
Indishrot 1984 Euro S AT (The Stepson) and Black Metallic 1984 Euro S 5 speed (The Schwartz)
Old 08-06-2013, 09:15 PM
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Good move is right!

No "just in case" about it.

Special relay. Am almost positive autozone won't match it.


But to try it, did you jumper the relay slot?
Did you use a three-ended jumper wire with spade ends?
30 to 87 to 87?

If this is the first time you've heard of that technique on L-Jet cars, then you might benefit from searching / reading for a few days on rennlist.
12 years worth of troubleshooting trials, tribulations and technical answers on cars like yours are in their archives.

Last edited by Landseer; 08-07-2013 at 02:13 AM..
Old 08-07-2013, 02:02 AM
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See Post #46
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Old 08-07-2013, 04:29 AM
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so although the relay from autozone fits the general idea is it won't work the same. well should be here friday keeping my fingers crossed.
Old 08-07-2013, 04:32 AM
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Quote:
Originally Posted by 81headache View Post
so although the relay from autozone fits the general idea is it won't work the same. well should be here friday keeping my fingers crossed.
81,
I know that you are new to the 928 scene and I am trying to take that into account Print out the fuse and relay chart that MPDano linked you to in an earlier post. Keep 2 copies. (One in the car at all times)
Almost every relay in your '81 is a specific and special relay. That being said, they must be placed in the specific spot in the fuse panel designed for that specific relay. No other relay will work in that specific spot for that specific duty.

The only "generic" relays that work correctly in "generic" spots are the 253B relays (sometimes denoted by a big 53 on the flat surface of the relay) and their less desirable but functional little sister the "24" relay, which is virtually the same generic relay as the 53 relay but the 24 relay handles less amps apparently. These 'generic relays are only to be installed in slots that call for the 253B relay.

I'm hoping that when the correct fuel injection relay arrives, you can plug it in the right slot and your car will start and run as you expect it.

Good Luck.
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John Curry (Drift King) 928OC member
Grand Prix White 1994 GTS AT (The GTS)
Black 1989 GT (The GT) and Cobalt Blue 1989 S4 AT (The Blue Car)
Indishrot 1984 Euro S AT (The Stepson) and Black Metallic 1984 Euro S 5 speed (The Schwartz)
Old 08-08-2013, 02:29 PM
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my hat is off to all of you with out your help my car wouldn't be running and home I have actually been driving it around such a joy. And yes you were all right that the oem relay was the fix thanks again
Old 08-09-2013, 07:47 AM
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my 28

Old 08-09-2013, 08:07 AM
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Cool! Paypal troubleshooting advice fee on it's way to you.
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Old 08-09-2013, 08:31 AM
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Glad you're good to go.
Old 08-09-2013, 07:23 PM
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May the BWWAAAAAAHH! be with you
Old 08-09-2013, 07:29 PM
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