Jam Master Jay
NAXJA Forum User
- Location
- Broken Arrow
I'm back seeking help with my restoration of a 1991 Briarwood.
It's been running great until I left it parked for awhile. Now when I crank it, it will fire off and then immediately die. If you try repeatedly it may occasionally stumble for a full second and then die. Holding down the gas pedal it may rev for a second and then die.
It was doing this a while back after being parked for awhile. I thought it was the CPS so I pulled it onto my driveway with my truck and before changing the CPS I tried to crank it and it started and ran normally. I went ahead and changed the CPS anyway. I drove it occasionally for several months before leaving it parked for about a month. Now it's doing the same thing again.
Here's what I know:
I'm guessing it's a sensor? I just can't think of what sensor it would be. I could be way off though. Any ideas you all may have are greatly appreciated.
Here's a video I made changing the CPS for anyone who wants to see the project. https://youtu.be/CoAY6QqAOyM?si=89WKMIAQCEVHIM1u
It's been running great until I left it parked for awhile. Now when I crank it, it will fire off and then immediately die. If you try repeatedly it may occasionally stumble for a full second and then die. Holding down the gas pedal it may rev for a second and then die.
It was doing this a while back after being parked for awhile. I thought it was the CPS so I pulled it onto my driveway with my truck and before changing the CPS I tried to crank it and it started and ran normally. I went ahead and changed the CPS anyway. I drove it occasionally for several months before leaving it parked for about a month. Now it's doing the same thing again.
Here's what I know:
- It's not the CPS. I changed that and unplugging this one and cranking results in no fire at all. Plugging it in results in that initial fire off before dying.
- I have 35 psi of fuel pressure at the rail. The fuel pump was replaced as part of the restoration project. I checked this with a fuel pressure gauge.
- It's getting spark, at least at first.
- The spark plugs are recent and look normal. No fouling or anything.
- The wires are recent.
- The distributor cap, rotor, and contacts have been cleaned and made no difference.
- The battery is fully charged and kept on a tender.
- I've checked the MAP sensor and it appears to work. When I unplug it, it will crank but not fire at all, similar to the CPS.
- It has fresh gas, I don't think it's gotten contaminated.
- It has brand new fuel injectors. I was worried the old ones were dirty or stuck from the bad fuel that had been left in it. I replaced the fuel tank, pump, and filter, but had not done the injectors. After changing the injectors it behaves exactly the same.
I'm guessing it's a sensor? I just can't think of what sensor it would be. I could be way off though. Any ideas you all may have are greatly appreciated.
Here's a video I made changing the CPS for anyone who wants to see the project. https://youtu.be/CoAY6QqAOyM?si=89WKMIAQCEVHIM1u