1991 Nissan 240SX Engine will not re-start

MIDWESTLADY

MEMBER
1991 NISSAN 240SX
4 CYL
2WD
MANUAL
150,000 MILES

I have a 1991 240SX, with 1997 engine. Car runs fine, except will not re-start if I turn off engine after running 15-20 minutes. Have to wait 15-20 minutes, then re-starts no problem.
Battery OK, fuel pump has been checked not overheating. Car not overheating, radiator fine, not losing water. Local mechanic has checked and re-checked electrical connections. Now replaced starter, problem persists.
Nissan dealership mechanic looked over and says replace spark plugs, coils, even carbeurator, but did not explain why car doesn't restart, so I'm not willing to do anything he suggests. (Don't think that mechanic actually took the car out on the road, my local guy did and experienced the no-restart problem.) My local guy (I live in the country of Oman, my mechanic if from Pakistan) is trying to help, but stumped.
Ideas?
Thanks.

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Lets do below for a start to determine if its fuel or spark related issue and get back asap.

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, 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, distributor pick-up coil, ignition control module, cam and crank sensors and computer Note: If it doesn't apply disregard it