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Kurte9542 · Sep 12, 2010, 10:30 AM

Was driving home from work on interstate 70-75mph, was running fine. About 1/2 a mile after exiting, the car slowly lost power. If I tried to advance the throttle past about 50%, the engine would die. Its top speed is about 20mph and takes about 2 minutes to get there. It idles very rough. While idling, I removed the fuel injector plugs one at a time; each cylinder reacted the same and when each was unplugged made the engine run noticeably worse. There's plenty of flow from the tailpipe, so I don't think it's the converter... I was hoping this sounded familiar to someone... Thank you in advance!

DG · Sep 12, 2010, 01:46 PM

Is your check engine light on.

TxGreaseMonkey · Sep 12, 2010, 02:49 PM

. Replace the platinum spark plugs with the same Motorcraft plugs that came in the car, if they have not been changed in 50,000 miles.

. Replace the coil pack.

Kurte9542 · Oct 10, 2010, 10:21 PM

Yes, the DTC's are: P1401, P1132, P0756 & P0172. The codes were read with the engine cold, not running, with the key in the "ON" position.

Kurte9542 · Oct 10, 2010, 10:22 PM

The NKG plugs have less than 1k miles, but I'll swap them out for the MCs. If that coil pack is $100 or less, I'll throw it on. The car won't even fire now, after I changed some bad vacuum lines...

Kurte9542 · Oct 11, 2010, 03:33 PM

Coil & plugs didn't fix. Checked & have spark. Old plugs smelled of gas but weren't wet. Engine sounds OK when cranking, but will check compression in the morning. Anything else I should check? Thanks.

TxGreaseMonkey · Oct 11, 2010, 04:43 PM

For P1401, check/replace the DPFE Sensor, located between the firewall and the engine. Look to two short sections of neoprene tubing.

Kurte9542 · Oct 12, 2010, 03:32 PM

Compression good: 160-175 psi. Sprayed brake cleaner in throttle body with throttle open; engine did not fire. Seems like no spark, but check showed OK. Maybe timing issue from a bad crank sensor? Its an interference motor so cam is prob OK.

TxGreaseMonkey · Oct 12, 2010, 05:01 PM

See if this link helps:

https://www.askmehelpdesk.com/cars-t...ml#post2123675

Kurte9542 · Dec 23, 2010, 07:17 PM

I took it to a shop. The timing belt tensioner had gone bad and the belt slipped by 1 tooth. I never looked at the cam-to-crank timing 'cause I thought this was an interference engine and would have noticed internal damage. I wanted to report back so next time you guys can tell someone to check the cam/crank timing; it doesn't take long to check and if you already have spark, its worth checking for a bad running engine...