stranded again what gives? ideas

NoDOHC · 09-21-2010, 07:08 PM

Actually, I had similar symptoms to this except for a completely different setup. It turned out to be the fuel pressure regulator. I checked compression and had 75psi bounces front and rear, so I knew that I needed to check fuel pressure.

I agree with My5ABaby, you should look at compression. I know for a fact that bad compression will cause the symptoms that you describe. So will bad coolant seals.

If I was helping you I would do the following in the following order:

Get long-hosed compression gauge, remove check valve, install in front rotor leading plug hole. Get friend to crank engine - verify consistent bounces at at least 50 psi. If you have a low face, it will misfire, but will still start. Re-verify compression with engine hot.

If compression is good, install fuel pressure gauge in the supply line to the engine.
Verify about 32-35 psi at idle and 42 psi at WOT. With engine warm, floor gas pedal and verify that fuel pressure maintains 42 psi at rev limiter.

If fuel pressure is good, check for vacuum leaks by starting a spraying starting fluid, pressurizing intake with shopvac and towel and checking for leaks with soap or any other means of testing for vacuum leaks that your mind can imagine.

If no vacuum leaks, verify ignition timing with timing light.

Verify all sensors per fsm.

Check for pressure in coolant system, no strange symptoms with temp gauge, etc. Attempt removing radiator cap while running (using a rag and being careful) before shutting off to verify that the restart issue is still present).

Scratch my head.

09-21-2010, 07:08 PM	#1
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 18	Actually, I had similar symptoms to this except for a completely different setup. It turned out to be the fuel pressure regulator. I checked compression and had 75psi bounces front and rear, so I knew that I needed to check fuel pressure. I agree with My5ABaby, you should look at compression. I know for a fact that bad compression will cause the symptoms that you describe. So will bad coolant seals. If I was helping you I would do the following in the following order: Get long-hosed compression gauge, remove check valve, install in front rotor leading plug hole. Get friend to crank engine - verify consistent bounces at at least 50 psi. If you have a low face, it will misfire, but will still start. Re-verify compression with engine hot. If compression is good, install fuel pressure gauge in the supply line to the engine. Verify about 32-35 psi at idle and 42 psi at WOT. With engine warm, floor gas pedal and verify that fuel pressure maintains 42 psi at rev limiter. If fuel pressure is good, check for vacuum leaks by starting a spraying starting fluid, pressurizing intake with shopvac and towel and checking for leaks with soap or any other means of testing for vacuum leaks that your mind can imagine. If no vacuum leaks, verify ignition timing with timing light. Verify all sensors per fsm. Check for pressure in coolant system, no strange symptoms with temp gauge, etc. Attempt removing radiator cap while running (using a rag and being careful) before shutting off to verify that the restart issue is still present). Scratch my head. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)