injection problems - Team Camaro Tech
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post #1 of 8 (permalink) Old Mar 28th, 01, 10:58 AM Thread Starter
 
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89z-28 350 tpi, motor wont start unless primed then runs just fine, fuel pressure is ok, any suggestions
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post #2 of 8 (permalink) Old Mar 28th, 01, 12:36 PM
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Does an 89 use the cold start injector? It may not be working. If I remember, it is on the drivers side towards the back.
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post #3 of 8 (permalink) Old Mar 28th, 01, 02:30 PM
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no, the '89 350 engine does't have a cold start injector. i have a similar problem with my '89 iroc. i put a pressure tester on the rail and got 50 psi from the pump when i turned the key. the pressure then dropped to about 12 psi in the space of about 5 seconds.
after some troubleshooting and cleaning lines out. i have narrowed the problem down to the in-tank fuel pump. it is old like i'm getting to be and worn out worse than i can ever hope to be. forgot to mention, it takes about 3 to 4 tries before the car will start. however, once it does, the fuel pressure stays steady at 43 psi. hope this will help you.
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post #4 of 8 (permalink) Old Mar 30th, 01, 03:17 AM
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<BLOCKQUOTE>quote:</font><HR>Originally posted by tuckstoy:
89z-28 350 tpi, motor wont start unless primed then runs just fine, fuel pressure is ok, any suggestions<HR></BLOCKQUOTE>

I'm not sure what you mean by "primed"? Please explain.

When taking a fuel psi reading, this needs done with the engine idling and the vacuum hose at the regulator disconnected & plugged. This will give an accurate reading.
When's the lst time the fuel filter was changed?


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67 Camaro LS6 454/TH400/12bolt 3.73
1989 TransAm 5.7L WS6 W/all the options

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post #5 of 8 (permalink) Old Mar 30th, 01, 05:10 AM Thread Starter
 
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the fuel pump is new from gm, same with the fuel filter. when the problem happened i conducted all the obvious checks, spark, fuel pressure, all checked fine. so i decide to spray fuel in the intake to see if it would start. it started and ran just fine, all systems go. i shut her down and came back a few hours later and the same problem existed. i was wondering if it could be either injector bleed or fuel pump relay
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post #6 of 8 (permalink) Old Mar 31st, 01, 08:19 AM
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Can you here the fuel pump cycle when the key is turned to the ON position?

------------------
67 Camaro LS6 454/TH400/12bolt 3.73
1989 TransAm 5.7L WS6 W/all the options

www.geocities.com/akfourme/
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post #7 of 8 (permalink) Old Apr 2nd, 01, 04:01 AM Thread Starter
 
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Location: louisiana
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fuel pump comes on and cycles, then shuts off after a few seconds. i can even hear the relay kick. the only thing that i don't hear is the injectors clicking at that time
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post #8 of 8 (permalink) Old Apr 2nd, 01, 11:03 AM
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the injector's only click when you try to start the motor, then when it is running. i would look for a bad conection in the starting circit. when you start the motor's injector's are running rich and fireing all at once. running the go into a mode where the fire as the intake valve open's, it is controled bu the distr pulses if i recall.it work's like this when #1 is fireing the injector for #4 is fireing, the fireing cycle is if i recall 2 ahead of the fireing order.i am going from memory and i am bit rusty on this subject as i have not worked on a F/I car in awile.

check all the fuses and all the conection's also make sure that the fuel pump will click on when the starter is running if is dose not there will not be enough fuel pressure to start the motor. this is controled by the ECM. you might have a bad conetion on the fuel pump start circit. oh well hope this get's going!

oh try starting it with a remote start switch with the key in the run position, this will bypass the cold start system, just an idea. if it start's this way you have narrowed down where to look for a problem.
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