Barely start, rough idle and stall

Tiny
DILLEY55
  • MEMBER
  • 2004 MERCURY MOUNTAINEER
  • 4.6L
  • V8
  • AWD
  • AUTOMATIC
  • 107,000 MILES
Hi. I have a 2004 mercury mountaineer awd. The original engine spun a bearing. I bought the car with the original engine removed and a 4.6 from a 02 explorer. I installed the 02 explorer engine. I used the intake and throttle body from the original motor (04) because the 02 had the wire throttle and the 04 was electronic. Used the mountaineer wiring harness. The engine was running ok. At idle it ran good, under load it was a little rough but drivable. I left the house one day and it ran fine for about 2 miles then I started losing power. Foot to the floor but still losing power. Anyway, finally stalled and would not restart. Towed it home. Started fooling with it at home it would start right up run good for 10-15 seconds then start idling and shaking badly then stall after 30 seconds or so. It did this for 5 or 6 starts, threw no codes but then got progressively harder to start. I have checked all fuses and tested the relays under the hood. Check a plug. It looked fine. Today I drained the gas tank and put fresher gas in it ( since I neglected to do it at the time of the engine swap). After that I got it to start (with a lot of pedal pumping) it ran real rough and would only stay running for about 2 minutes. To keep it running I had to keep working the accelerator almost to the floor and back with rpms barely breaking 1500. After it stalled the code reader gave me these codes. P0122 tps circuit low input. P0193 ful rail pressure A circuit high input. P0223 tps/switch B circuit high input. P2110 throttle actuator control system forced limited revolutions per min. And p2135 tps / switch A/B voltage correlation. Also the display said it was in failsafe mode. I also cleaned the Mass air sensor. Voltage tested the fuel rail pressure sensor. It tested 5 volts. I also tested the tps. It has 4 wires I got 5 volts from the two middle prongs. I'm pretty new at this voltage/electrical stuff but I think I did it right from what I could find on the internet. I also dont think I have any vacuum leaks as they were just attached, but I am not 100% sure all the lines are hooked up where they are supposed to go. I have a picture of the engine attached. The question is, could it be as simple as a bad TPS? Or do I have a PCM problem since I switched engines. Also I turn the radio off but when I turn the ignition on it will come back on. Weird. I put a new EGR on it also. Sorry I keep thinking of things as I go.
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Wednesday, April 1st, 2015 AT 8:18 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Do you have a good hot blue snapping spark at the plugs? Is the fuel PRESSURE within the manufacturer's specs?
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Wednesday, April 1st, 2015 AT 9:29 PM
Tiny
DILLEY55
  • MEMBER
I haven't tested spark .I am working by myself and don't have anyone to turn the key. Fuel pressure reads 42 to 45 on the code reader
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Thursday, April 2nd, 2015 AT 4:15 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Is there any way you could get someone to crank it while you check for spark? If it's weak, that could be the cause.
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Thursday, April 2nd, 2015 AT 7:09 PM

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