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94 doesn't want to run

Tiny
RJENGEN
  • MEMBER
  • 1994 ALL OTHER MAKES ALL OTHER MODELS
I have a 4.6 94 Cougar, with 130,000 miles on it. A couple of weeks ago, I went to start it up and let it warm up in the morning before work, and it died. I tried starting it up again and it idled for a brief moment then died again. I once again started it up, and idled it up to around 1500-200 rmp, and it ran rough for 15 seconds (when I say rough, think of v-8 running on 4 or 5 cylinders) then it cleared up. Let it idle down, and it died again. I have no codes, however, I have changed the fuel filter, as well as checked the fuel pressure on the rail, and it is with in spec. It will run while it's cold, then dies when it warms up, and won't start worth a damn. I am thinking some sort of electronic choke issue, or something with the air intake. I've tried searching the clymers, but can't find anything relivent, or maybe I just don't know what exactly to look for Can you boys give me any idea's to steer me in the right dicrection. Thanks
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Thursday, December 28th, 2006 AT 2:58 PM

10 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Check for vacuum leaks at the rear of intake where the pcv like connects to the intake. It might be a coolant sensor issue, without a code or scanner, I would take care of the basics first
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Thursday, December 28th, 2006 AT 3:31 PM
Tiny
RJENGEN
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  • 5 POSTS
Checked the pressure regulator on the fuel rail, and it held under vac, as well as the vacume line hooked to it that runs to the intake manifold which had strong vac while running. Briefly till it died. Lol. Coolant sensor.I am interested in this, it there a way to check and see if it's good without tossing a new one in (I'm all about crossing wires and bypassing stuff if need be. ;-P
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Thursday, December 28th, 2006 AT 5:50 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Hey Jack,

Wasn't there somthing about the egr passageways plugging up on these? :Idea: Any possible relationship? Us Service Writers somtmes think they might know something but are often in left field! :Lol:
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Thursday, December 28th, 2006 AT 6:11 PM
Tiny
RJENGEN
  • MEMBER
  • 5 POSTS
There's a quick blurp in the book about the EGR, but no map of where it is :lol: go figure. I'm not the sharpest tool in the shed, but I thought I would toss this out there. I have no check engine light on in the dash, could there still be code's, or does the light only come on where there is a code? For 100 bucks I could go and grab a code reader, and that might solve all my problems of figuring out what's wrong, and get me started on rectification?
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Thursday, December 28th, 2006 AT 6:54 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
I'm not a technician and I don't play one on TV, but there could be a codes without the check engine light lit. I think autozone will scan the ecm for free, Not that I'd buy parts there :).

There is a thing called "mode 6" that further divides the codes into smaller tests that can be helpful. It's a little tricky and I'm just learning about it;has to do with the hexidecimal system-whole other subject anyways.

I don't want to go leading you down the wrong path, maybe one of the heavy hitters can help out without you re-wiring the car :).
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Thursday, December 28th, 2006 AT 7:50 PM
Tiny
RJENGEN
  • MEMBER
  • 5 POSTS
Did a little digging and reading and that got me thinking. Hope one of you heavy hitters can correct me, and or lead me. The car, to my understanding, runs with out a distributor, and uses DIS. The fact that the car can idle for a bit, then go rough and stall out, or just run rough from the get go makes me think it's an issue with the DIS. I'm a bike guy, so most of my knowledge in that area, but putting two and two together. You see where I am going. Can the normal pull each plug wire and see what's not firing be applied in this situation? Going to try it anyway, but in the mean time, if someone has ever heard of an issue like this on a similar engine, and can further my checking. Please do, and would be much appreciated.
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Friday, December 29th, 2006 AT 12:16 PM
Tiny
RJENGEN
  • MEMBER
  • 5 POSTS
Picked up a code reader. No active codes present
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Saturday, December 30th, 2006 AT 7:36 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
This is easy and cheap and may help. Remove and clean the egr valve and more importantly the idle air control valve. They may be dirty enough to cause problems but not bad enough to set a code.
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Saturday, December 30th, 2006 AT 8:48 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Idle Air control motor or maybe the Mass Airflow Meter.
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Wednesday, January 3rd, 2007 AT 12:36 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
All cars with oxy sensors operate cold engine without adjusting pcm for 02, 02 sensors must reach 600 degrees to work, try looking at at least the wiring in that cicuit. Check under the car rap on converters for junk loose inside em, then try at muffler, could be, partially plugged with coverter material, and I don't wanna step on more knowledgable toes here!
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Thursday, March 8th, 2007 AT 4:56 PM

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