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Author Topic: 94 Turns over won't start!!!!  (Read 16456 times)

Rocketman

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Re: 94 Turns over won't start!!!!
« Reply #15 on: March 24, 2014, 06:05:45 PM »

It can be a weak battery, corroded wire, crappy connect at the pump under the seat. The pump itself could be worn out.
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shep83

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Re: 94 Turns over won't start!!!!
« Reply #16 on: March 24, 2014, 10:48:07 PM »

YES, the tach bounces slightly as the motor turns over.
I can't believe I didn't really notice that I had a tach..

ROCKETMAN, you sound like you're leaning toward the fuel pump..

It's been raining here all day, I did replace the fuel filter just to cover all bases with no change...

I will replace the fuel pump and hope that gets it, If that doesn't do it I will have to order the PCM..

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Rocketman

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Re: 94 Turns over won't start!!!!
« Reply #17 on: March 24, 2014, 11:54:39 PM »

It's so hard to diagnose an issue like this without the car in front of me.

Good that you have tach signal!

Have you tried probing the injectors with your ear up against the (handle!) end of a screwdriver? You'll hear/feel it firing
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shep83

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Re: 94 Turns over won't start!!!!
« Reply #18 on: March 25, 2014, 02:28:40 PM »

OK I did the screw driver test and I didn't here any clicking....

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Rocketman

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Re: 94 Turns over won't start!!!!
« Reply #19 on: March 25, 2014, 04:06:56 PM »

Okay. That narrows things down a bit. If the injectors are getting constant +12 battery power then they're getting grounded by the ECU...could be the ECU. I'd triple check ALL the fuses (under hood & under dash) before springing for another ECU

Could be a bad connection between the injectors and the ECU. Plug that got wet or kicked, etc...

I know you've checked & confirmed fuel but theres the safety rollover switch in the trunk
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shep83

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Re: 94 Turns over won't start!!!!
« Reply #20 on: March 25, 2014, 06:21:24 PM »

doesn't rollover switch deactivate fuel pump??
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shep83

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Re: 94 Turns over won't start!!!!
« Reply #21 on: April 02, 2014, 06:55:29 PM »

 >:( >:( >:( >:( >:(
Got my new PCM today...

STILL DOESN"T START!!!
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shep83

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Re: 94 Turns over won't start!!!!
« Reply #22 on: April 03, 2014, 08:18:36 AM »

What are your thoughts on Throttle Position Sensor???

Anybody out there have one?!?!?!?!?!?!?
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Rocketman

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Re: 94 Turns over won't start!!!!
« Reply #23 on: April 03, 2014, 10:09:10 AM »

TPS won't cause a no-start condition.
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shep83

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Re: 94 Turns over won't start!!!!
« Reply #24 on: April 03, 2014, 11:02:18 AM »

Here is the explanation from the Ask a Pro guys...

"If you are sure you have good fuel pressure and spark then you either have a defective PCM or your TP sensor is bad . If the TP sensor is stuck in the wide open throttle position it will shut the injector pulse off. Check power to the injectors on the BK/W wire when cranking. It should be battery voltage. If okay, check for 5v on the Vref circuit to the TPS, on the W/BK wire and check to make sure that the TPS voltage on the OG wire is not shorted high. The signal voltage should read roughly 0.5v Key On Engine Off and on a closed throttle. Any thing different would me its stuck wide open. "
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Rocketman

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Re: 94 Turns over won't start!!!!
« Reply #25 on: April 03, 2014, 12:36:07 PM »

Try disconnecting the TPS. That will throw the ECU into limp mode. If it still does not start, it's not the TPS.
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shep83

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Re: 94 Turns over won't start!!!!
« Reply #26 on: April 03, 2014, 03:20:50 PM »

I will try it when I get home.
I'm running out of ideas other than have it towed to a garage but I don't know if it's worth it.

I have 12v power at the injector so it isn't the relay...
I replaced the PCM, no change (possible new PCM is no good, but unlikely)

The only thing left is the fuel pump and it runs and I have 30 PSI, all the mechanics I know say it should run on 30 PSI.
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Rocketman

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Re: 94 Turns over won't start!!!!
« Reply #27 on: April 03, 2014, 03:36:13 PM »

FSM specs 37-41 PSI when running at idle. That number should be closer to 55psi without any vacuum on the FPR (static test without the engine cranking, pump test plug jumpered)
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shep83

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Re: 94 Turns over won't start!!!!
« Reply #28 on: April 03, 2014, 05:03:46 PM »

So you would replace the fuelpump..
The only reason I haven't is because that's the one part I can't take back..

I can't even lie and say I didn't put it on the car.
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Rocketman

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Re: 94 Turns over won't start!!!!
« Reply #29 on: April 03, 2014, 05:47:05 PM »

Quote from: shep83
So you would replace the fuelpump..

If it were me I'd be testing everything thoroughly with a multi-meter and checking for absolute certain that the injectors are or are not firing. Can you rig up a small LED with a resistor to use as a "Noid light"? Because you said this earlier:

Quote from: shep83
OK I did the screw driver test and I didn't here any clicking....

While the engine was cranking, correct?

Two very different issues (fuel pump vs ECM) and replacing parts is expensive and testing for the most part only takes time. Your fuel pressure test is low but not a smoking gun here

And to be sure - the intake piping is all intact and tight? Even after you spray startfluid into the throttlebody, you put the pipe back securely? The engine will NOT continue to run without drawing are through the VAF unit bolted to the filter box. The fuel pump switch is inside the VAF and only turns on when there is airflow. I mention this because I've seen a LOT of people run into this, and it's a simple thing to fix. Also occurs when the piping slips off, cracks, etc.
« Last Edit: April 03, 2014, 05:51:23 PM by Rocketman »
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