12-14-2008, 11:46 AM
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Senior Member
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Join Date: Oct 2005
Location: Mebane, NC
Posts: 4,841
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This confuses me:
 Quote:
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you can rev the engine up but once it desides to stop it just putters out...
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Common things happen commonly so check the usual supects: intake air leaks & iffy grounds. The L-jet system is very sensitive to 'false air' - air that bypasses the AFM (Air Fuel Meter) will mess up the proper signals for fuel injection. So check carefully for loose, cracked or missing air & vacuum hoses. And the computer switches the injectors by controlling their ground connection so any iffy grounds will adversely affect proper operation. Don't trust that the connections look or feel OK, remove them, clean them and re-secure them. The main computer grounds are on the intake & the cam cover.
The drive relay is the other vital component. It must 'see' a tachymetric signal via the coil to then switch on and supply power to the fuel pumps. The drive relay will briefly power on the fuel pumps when you switch the ignition on but then it stops supplying power until the engine starts and the coil's field rises & falls signalling to the drive relay that the engine is running.
The CSI (Cold Start Injector) is not under control of the drive relay or the computer. It will squirt fuel for a few seconds based on the temp of the coolant.
Make sure the harness plug for the AFM is connected securely. And that the flap inside the AFM moves smoothly through its range of motion.
Peruse the Spider L-jet diagnosis page - a link is in my signature. I suggest you go through everything outlined there. The L-jet is a system - all components must be 100% for it to work properly & reliably.
Last edited by ghnl; 12-14-2008 at 11:49 AM.
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