Needs some ideas to check

Tiny
CJSTAFFORD
  • MEMBER
  • 1987 MERCURY MARQUIS
  • 124,000 MILES
Needs some ideas to check. Only after the car warms, it will sputter every now and then. It is very intermittent. Also, it will sputter on deceleration and some times even stall the car.
Things changed already:
plugs, wires, fuel filter.

The air filter is clean. The throttle body is clean. IACV seems to be working properly and is currently being cleaned. Also going to check for vacuum leaks. Is there anything I am missing to inspect? Thanks
Thursday, March 21st, 2013 AT 5:15 PM

7 Replies

Tiny
CJSTAFFORD
  • MEMBER
  • 5 POSTS
Could this (Picture) be the culprit?
Was this
answer
helpful?
Yes
No
Thursday, March 21st, 2013 AT 5:42 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You cannot clean the iac valve. It has to be replaced if not working correctly.

Look for coolant leaks around wires going down to plugs. Intakes are common for this type of issue with running

Roy
Was this
answer
helpful?
Yes
No
Thursday, March 21st, 2013 AT 7:51 PM
Tiny
CJSTAFFORD
  • MEMBER
  • 5 POSTS
Oh, I read you could clean them. My bad. I verified it is working correctly. There were no air leaks. The water pump is shot and leaking straight out of itself. Before I found this out, I did a fuel pressure test. A guy from Ford said there should be 35 lbs of pressure and there was only 28-30. Also, the pressure did not change as the throttle increased. Seems to be a bad fuel pump to me. I did not get a chance to see if the coolant was leaking on the plugs though. What do you think?
Was this
answer
helpful?
Yes
No
Thursday, March 21st, 2013 AT 9:36 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
How did you check the IAC to determine it is working perfectly?

I would look at the plugs, wires and coil.

Fuel pressure is too low

Roy
Was this
answer
helpful?
Yes
No
Thursday, March 21st, 2013 AT 11:22 PM
Tiny
CJSTAFFORD
  • MEMBER
  • 5 POSTS
I don't know that I can say "perfectly" but is is working. The idle is off without it plugged in and controls when it is plugged in. Is not a proper way to determine that? Plugs and wires have already been replaced.
Was this
answer
helpful?
Yes
No
Thursday, March 21st, 2013 AT 11:26 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
With it disconnected, the idle should be 500 rpm, not shut off.

Roy
Was this
answer
helpful?
Yes
No
Friday, March 22nd, 2013 AT 12:23 AM
Tiny
CJSTAFFORD
  • MEMBER
  • 5 POSTS
Sorry, I meant off from normal and then it fixes itself when it is reconnected.
Was this
answer
helpful?
Yes
No
Friday, March 22nd, 2013 AT 12:24 AM

Please login or register to post a reply.

Sponsored links