850 won't idle, quits and will run with gas pedal to the floor

  • Thread starter Thread starter Dan Behr
  • Start date Start date
D

Dan Behr

Hi all,

Here's the story:

1) Engine starts, runs for a short time, then quits.
2) After restarting, engine will not idle, but as the engine dies, if
you mash the pedal to the floor, it will keep running. And, after you go
to the floor, you can moderate it, so you can maintain about 3-4000 rpm.

3) If you let up on the pedal it'll quit.
4) Initial codes showed P1401 and P0115, fault in ECM, with a DTC of
1-1-2.
5) Replaced both computers. No improvement, BUT the error codes
disappeared.
6) Tried another ignition module and coil. No results.
7) Fuel pressure and flow are just fine.

Any ideas?

Thanks....
 
Dan Behr said:
Hi all,

Here's the story:

1) Engine starts, runs for a short time, then quits.
2) After restarting, engine will not idle, but as the engine dies, if
you mash the pedal to the floor, it will keep running. And, after you go
to the floor, you can moderate it, so you can maintain about 3-4000 rpm.

3) If you let up on the pedal it'll quit.
4) Initial codes showed P1401 and P0115, fault in ECM, with a DTC of
1-1-2.
5) Replaced both computers. No improvement, BUT the error codes
disappeared.
6) Tried another ignition module and coil. No results.
7) Fuel pressure and flow are just fine.
Click to expand...


Is it appearing to be running rich or lean, when it runs? Which engine too?
Need to know if it uses MAP or AMM for load monitoring...

Tim..
 
The engine is a non-turbo 5 cylinder (5254 I think) 20 valve.
Need to know if it uses MAP or AMM for load monitoring...
Click to expand...

How can I determine this? Is there some kind of designation in or around the
engine?
 
Dan Behr said:
The engine is a non-turbo 5 cylinder (5254 I think) 20 valve.


How can I determine this? Is there some kind of designation in or around the
engine?
Click to expand...


No, its determined by the engine code. You have an AMM type system.

Also check that the main induction hose isnt split or the clamps are loose.

Tim..
 
I did check the main induction hose and it did have a tear in it. For the time
being, it's been duct taped, to seal the air leaks. However, the problem still
persists. (You do mean the segmented 3-4" diameter air induction hose, like a
vacuum cleaner hose, right?)
 
I just talked to the mechanic regarding possible air leaks in the air induction
hose and he said that he thought of that, so he disconnected the plug to the
air mass meter. He said that in that case, the engine should have been able to
continue idling, but it doesn't. What do you make of that?
 
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