Pontiac Sunfire help

TWYSTID FABRICATION

MEMBER
1997 PONTIAC SUNFIRE
4 CYL
FWD
MANUAL

I have a 97 Pontiac sunfire 2.2L, it was overheating with a cracked radiator tank. While replacing that I noticed that the fuel pressure regulator had a drip, so I replaced it. Car ran great for about a week, I parked it for the night, when I went to start it the following morning, it just cranked. It tried to fire a couple time, but wouldnt start. After digging deeper and even putting the old regulator on (just to see) still nothing. I have fuel, air, spark and compression. It had a small backfire through the intake once or twice, but nothing major. It dealt seem to be out of timing, and ran fine till it just didn't start. Any help would be great, I'm stuck!

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Do below

Get a helper disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 away from ground-have helper crank engine over-do you have a snapping blue spark? If so-you have a fuel related problem, Do you hear the fuel pump come On when you turn key on? If not check fuel pump fuse and fuel pump relay if okay-check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light. No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it and keep testing

If both fuel and spark is present-check the valve and ignition timing, this will lead you to problems
with compression and valves opening and closing at the wrong time/broken or jumped timing
belt/chain.