LT-1 issue
 

Fired up LT-1 after rebuild and all appeared to be well. At initial start up, only ran the engine to around 2500RPM.
Loaded up and went to track.
At track, warmed up and drove to tech and back to trailer. went to 3000and all was well
After adding fuel to cell and a quart of trans fluid, headed to lanes. Car would not accelerate driving to lanes, headed back to trailer.
As it sits now, car will start, idle, and immediately stumble as the throttle is opened...like it is not getting fuel.
Gas was a new sealed container of renegade 110+
Fuel map same as last year
Rebuild included new rings, bearings, cam, valve springs and a different set of heads.
Before initial start, I flushed the fuel system and replaced the fuel filter.
Looking for possible causes.
Bad fuel?
Throttle position sensor?
Any ideas??
Thanks for any help.

John

Re: LT-1 issue
 

what was the fuel pressure at ?

Re: LT-1 issue
 

You didn't mention anything about timing. Have you checked it? If so, where is it?

What engine management system are you using?

Re: LT-1 issue
 

Fuel pressure at 45psi. We did notice that the fuel pressure gauge seemed to drop more quickly once the engine was shut off. Typically, the reading on the gauge very slowly declines after shut off of system.
The timing is set at 42 degrees and I have an old style Accel Cal Map system.

Thanks.

Re: LT-1 issue
 

Make sure the MAP sensor wiring, and sensor is OK. If you removed the sensor, from last year, make sure the seal to the intake is in good condition.

Re: LT-1 issue
 

I'll check that . I did remove it since last year.

Re: LT-1 issue
 

Use a OHMS meter and sweep test the TPS sensor.

Re: LT-1 issue
 

If the fuel pressure drops fairly soon and/or quickly after you shut the vehicle off, you need to test fuel pressure and volume, as well as determine whether or not the fuel pump used has a check valve. If fuel pressure did not drop when the car ran before, but does now, I suspect the pump is supposed to have a check valve, and there is now a problem.

Re: LT-1 issue
 

Broken ignition rotor.

Re: LT-1 issue
 

Dyno, Brand new MSDcap and rotor.
Alan, How would a faulty check valve in the pump react?
Will check the TPS for sweep again. Checked it in the fall and it was OK.

Re-terminated 3 TPS leads as the old terminals seemed loose. This did not solve problem. Also pulled back timing to 36......no difference.