Ruff Idle ,Huge Loss of Power

[Tripler]

Originally Posted by Paul Workman

There is a Schrader valve at the front of the passenger side fuel rail. Attach a pressure gauge there for static pressure tests, (AND (FYI) if you purchase an extension hose, you can do impromptu dynamic tests by taping the pressure gauge to the windshield and going for a drive (not necessarily applicable to this particular problem))

So 200 mph tape then [emoji39]

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[Tripler]

Originally Posted by Paul Workman

There is a Schrader valve at the front of the passenger side fuel rail. Attach a pressure gauge there for static pressure tests, (AND (FYI) if you purchase an extension hose, you can do impromptu dynamic tests by taping the pressure gauge to the windshield and going for a drive (not necessarily applicable to this particular problem))

Tight fit but I was able to attach a fuel pressure gauge . With key on , pressure held at 48 psi for 3 minutes or so .

Thanks



Mike

[Tripler]

Originally Posted by Paul Workman

If that MAP hose(s) were disconnected and now restored, I'd wanna pull and inspect the plugs. Could be some plug(s) got fouled and will run OK when they are cleaned up.

Experience is generally a good thing when troubleshooting; it can lead one to the issue sometimes immediately. But! If guessing at the solution proves not to be the case (fix), it"s back to the basics time!

FUEL PRESSURE (static) = ?
Current draw on the pump diagnostic test point (red wire about 5cm long w/ a black terminal sticking out of the large wire loom near the W/S wiper motor) when ignition key is in the OFF position [8-10 amperes is normal for both pumps running nornally].

Let us know what U find...

Yes . Will be pulling the plugs and let you know whats up . The way it was running I guarantee there fouled for sure . Will clean them first before fuel filter change and see if it runs smoother .

Thanks Paul .

Mike

[Tripler]

Originally Posted by Paul Workman

If that MAP hose(s) were disconnected and now restored, I'd wanna pull and inspect the plugs. Could be some plug(s) got fouled and will run OK when they are cleaned up.



Experience is generally a good thing when troubleshooting; it can lead one to the issue sometimes immediately. But! If guessing at the solution proves not to be the case (fix), it"s back to the basics time!



FUEL PRESSURE (static) = ?

Current draw on the pump diagnostic test point (red wire about 5cm long w/ a black terminal sticking out of the large wire loom near the W/S wiper motor) when ignition key is in the OFF position [8-10 amperes is normal for both pumps running nornally].



Let us know what U find...

Hi Paul . So the amp draw is only 7 amps and the fuel pressure reading was at 47 psi [emoji849][emoji3525][emoji853]

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[Ccmano]

Originally Posted by Tripler

Hi Paul . So the amp draw is only 7 amps and the fuel pressure reading was at 47 psi [emoji849][emoji3525][emoji853]

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You have at least one bad pump. Pull the FP1 pump fuse and check again. That will give you the reading for FP2. Subtract that number from the combined number (in your case 7 amps) and you’ll have the reading for FP1. You might as well just replace both pumps while your in there.
H

[Tripler]

Originally Posted by Ccmano

You have at least one bad pump. Pull the FP1 pump fuse and check again. That will give you the reading for FP2. Subtract that number from the combined number (in your case 7 amps) and you’ll have the reading for FP1. You might as well just replace both pumps while your in there.
H

Thanks . Yes , if one is bad , may as well change both . thanks again for all the help Ccmano and from everyone on the forum .



Recommendations for which pump to purchase ?

1995 ZR-1









Mike

[Tripler]

I am seeing and smelling gas inside this 90 elbow . Obviously the car is flooding . Tried looking under the plenum with the scope but that's useless as I have no idea what I would be looking for

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[Tripler]

Is there supposed to be something attached to this brass spigot ? I don't ever remember seeing anything attached before . The tube you see is the scope as I used it's lights to highlight the spigot


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[Ccmano]

Is that elbow in the vacuum line to the fuel pressure regulator? If there’s gas there the fuel pressure regulator has failed, could be the source of you problem.

The “spigot” you refer to (if I interpreted you post correctly) is the vent for the vacuum solenoid. No lines attach there.
H

[Ccmano]

If you have a hand held vacuum pump attach it to the fuel regulator and pump it up to no more than 10 psi. If the vacuum doesn’t hold the regulator is bad.
H