To anyone who at least reads this....THANK YOU..I'm at a loss here.
I've been working on cars and trucks my whole life, and I've never run into this problem, and for months I havn't been able to figure it out.
I have a 94 Grand Cherokee Laredo, close to 270,000 miles on it. Looks great, runs really good for as many miles as it has. When it runs. For some reason, and at seemingly random times, the ignition/fuel system just shuts down. No warning, everything just goes dead. Let it sit for a few hours or overnight, starts and runs (until it dies again). The really weird part....when it dies, the Check Engine light and the fuel pump won't come on. Everything else works fine, sensors on the motor all have voltage where they should, motor turns over, coil has power, etc... The only thing I could think of was a bad ECU, whiich dosn't make real sense, because as stated, when it runs, it runs great. After some reading on the web and talking to a few mechanics I know, I thought it might be related to the security system...but there is none. I checked behind the glovebox and there is no VTSS controller. Interesting, because the serial number on the ECU (56028300) references to a vehicle equiped with a security system.So I tried unlockng and locking and vice-versa all the doors and rear deck, no change. From what I've read and been told, if the ECU is from a security model, it shouldn't run at all if installed in a non-security model. So i tried another ECU from a similar jeep (federal emmisions, no security, 4.0l, automatic) only 1 year newer (serial# 56028026). With that ECU the truck fires, but won't stay running more than 2 seconds. It came from a running but wrecked 95 GC. Im about at the end of my wits with this........
If someone out there has ANY clue what to do besides set the thing on fire, PLEASE let me know!!!!!!:brickwall
Also kindly send messages to jasonenglish77@gmail.com if possible, or jason@surferz.net. Thanks in Advance!!
1994 Jeep Grand Cherokee Laredo
4.0l
Auto, 4WD
all stock running gear
266,000miles and counting (hopefully)
I've been working on cars and trucks my whole life, and I've never run into this problem, and for months I havn't been able to figure it out.
I have a 94 Grand Cherokee Laredo, close to 270,000 miles on it. Looks great, runs really good for as many miles as it has. When it runs. For some reason, and at seemingly random times, the ignition/fuel system just shuts down. No warning, everything just goes dead. Let it sit for a few hours or overnight, starts and runs (until it dies again). The really weird part....when it dies, the Check Engine light and the fuel pump won't come on. Everything else works fine, sensors on the motor all have voltage where they should, motor turns over, coil has power, etc... The only thing I could think of was a bad ECU, whiich dosn't make real sense, because as stated, when it runs, it runs great. After some reading on the web and talking to a few mechanics I know, I thought it might be related to the security system...but there is none. I checked behind the glovebox and there is no VTSS controller. Interesting, because the serial number on the ECU (56028300) references to a vehicle equiped with a security system.So I tried unlockng and locking and vice-versa all the doors and rear deck, no change. From what I've read and been told, if the ECU is from a security model, it shouldn't run at all if installed in a non-security model. So i tried another ECU from a similar jeep (federal emmisions, no security, 4.0l, automatic) only 1 year newer (serial# 56028026). With that ECU the truck fires, but won't stay running more than 2 seconds. It came from a running but wrecked 95 GC. Im about at the end of my wits with this........
If someone out there has ANY clue what to do besides set the thing on fire, PLEASE let me know!!!!!!:brickwall
Also kindly send messages to jasonenglish77@gmail.com if possible, or jason@surferz.net. Thanks in Advance!!
1994 Jeep Grand Cherokee Laredo
4.0l
Auto, 4WD
all stock running gear
266,000miles and counting (hopefully)