v8mountaineer5.0
New Member
- Joined
- October 18, 2011
- Messages
- 9
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- City, State
- VA
- Year, Model & Trim Level
- 1998 Mountaineer 5.0 V8
So I have a 1998 V8 5.0 Mountaineer - AWD. It's completely stock except for the MAC Cold Air Intake. So a few weeks ago when i checked it was just throwing just a p0401 (insufficient flow). Now its throwing p0401 and p0402(excess flow). So I decided to do some tests on the EGR system.
So here is what I have found so far:
The EGR valve holds vacuum and does not leak. The vehicle stutters and starts to stall when I apply vacuum to the EGR valve.(This means the passages are clean enough right?)
I back-probed the DPFE signal wire to ground and measured ~ 5 volts at idle. I hooked the Vacuum gun up to the EGR valve and applied vacuum the car began to stall but there was no change in the DPFE signal.
I back-probed the vpwr to make sure there was a constant power supply to the dpfe which was about 5.10 volts (near the same voltage as the DPFE signal). SO THE POWER IS GOOD.
With the Vacuum pump still connected to EGR: I also back-probed the return signal wire at the DPFE (middle wire on connector) to ground. The signal range varied from about 200mV to 100 mv. The norm for this signal was about 180 mV decreasing to about 160 mV. There was no change in this signal when vacuum was applied to the EGR.
The resistance across the signal return to ground was 50 ohms.
So I'm thinking I have a fried DPFE because the Signal Voltage is way too high at idle. I've read it should be like .55v or 1.0 v for the metal DPFE.
I'm kinda guessing the power shorted to the return signal.!! Causing the PCM to be confused.
I also have a p0340 code from my camshaft sensor which has been going on for a while could this be related / receiving a stray signal from the DPFE short?
Once it stops snowing I'll do some tests on the EVR to see if it is functioning properly.Anyone think it could be the EVR instead?
Thanks in advance for any help
So here is what I have found so far:
The EGR valve holds vacuum and does not leak. The vehicle stutters and starts to stall when I apply vacuum to the EGR valve.(This means the passages are clean enough right?)
I back-probed the DPFE signal wire to ground and measured ~ 5 volts at idle. I hooked the Vacuum gun up to the EGR valve and applied vacuum the car began to stall but there was no change in the DPFE signal.
I back-probed the vpwr to make sure there was a constant power supply to the dpfe which was about 5.10 volts (near the same voltage as the DPFE signal). SO THE POWER IS GOOD.
With the Vacuum pump still connected to EGR: I also back-probed the return signal wire at the DPFE (middle wire on connector) to ground. The signal range varied from about 200mV to 100 mv. The norm for this signal was about 180 mV decreasing to about 160 mV. There was no change in this signal when vacuum was applied to the EGR.
The resistance across the signal return to ground was 50 ohms.
So I'm thinking I have a fried DPFE because the Signal Voltage is way too high at idle. I've read it should be like .55v or 1.0 v for the metal DPFE.
I'm kinda guessing the power shorted to the return signal.!! Causing the PCM to be confused.
I also have a p0340 code from my camshaft sensor which has been going on for a while could this be related / receiving a stray signal from the DPFE short?
Once it stops snowing I'll do some tests on the EVR to see if it is functioning properly.Anyone think it could be the EVR instead?
Thanks in advance for any help