marksweepe
New Member
- Joined
- November 18, 2012
- Messages
- 1
- Reaction score
- 0
- City, State
- Seattle WA
- Year, Model & Trim Level
- 1998 Ford Explorer
Just joined the forum as I'm becoming stumped with my sons 1998 Explorer 4l SOHC. The engine suddenly quit. He thought he'd run it out of gas, but I'm skeptical. Since the failure, we've had it fire upon the initial cranking, but after the first few firings, or maybe just one, nothing. Crank again for a minute and not one fire. Consistently, it will fire only after sitting for hours, maybe a day. We added fuel to the tank, removed the fuel filter, turned the pump on to clear fuel in the line, and installed a new filter. The fuel from the line was clean and quickly filled a tin can. Depressing the valve at the fuel manifold releases fuel and pressure. I'll purchase a pressure test kit tomorrow to check the pressure. A scan provides the following errors:
P0171, 0174, 0175, 0302, 0303, 0304, 0305, and 0306
I've begun checking each of the sensors per the Haynes manual. Most peculiar are the cam shaft and crank shaft position connector checks: the CMP shows nearly nothing on either socket (0.02 to 0.04v), the CKP shows about 1.5 volts on BOTH sockets. I didn't get a variation on the CMP sensor pins while cranking, though this may be a figment of my cheap digital multimeter. The similar check on the CKP showed a slight variation: 0.3 to 0.4 volts. I suspect this multimeter has a very slow refresh rate, perhaps too slow to catch the CMP variation. Unfortunately, my analog multimeter has a blown AC function.
I'd replace the CMP sensor if it weren't for the odd supply voltage from the PCM to it and the CKP. Is a PCM known to go haywire suddenly? Can they be pulled from the vehicle and tested?
The TPS, ECT, and IAT read good. Well, the temperature senors indicate proper resistance while cold. At the rate I'm going, they may never read hot again.
While I'm new to this forum, I've learned a lot from a similar Mustang forum. The project car is a 95 GT. The Explorer just keeps me humble. I'd be very grateful for any guidance you can offer.
P0171, 0174, 0175, 0302, 0303, 0304, 0305, and 0306
I've begun checking each of the sensors per the Haynes manual. Most peculiar are the cam shaft and crank shaft position connector checks: the CMP shows nearly nothing on either socket (0.02 to 0.04v), the CKP shows about 1.5 volts on BOTH sockets. I didn't get a variation on the CMP sensor pins while cranking, though this may be a figment of my cheap digital multimeter. The similar check on the CKP showed a slight variation: 0.3 to 0.4 volts. I suspect this multimeter has a very slow refresh rate, perhaps too slow to catch the CMP variation. Unfortunately, my analog multimeter has a blown AC function.
I'd replace the CMP sensor if it weren't for the odd supply voltage from the PCM to it and the CKP. Is a PCM known to go haywire suddenly? Can they be pulled from the vehicle and tested?
The TPS, ECT, and IAT read good. Well, the temperature senors indicate proper resistance while cold. At the rate I'm going, they may never read hot again.
While I'm new to this forum, I've learned a lot from a similar Mustang forum. The project car is a 95 GT. The Explorer just keeps me humble. I'd be very grateful for any guidance you can offer.
