1995 Ford Taurus Engine changes

Tiny
RSUKOVICH
  • MEMBER
  • 1995 FORD TAURUS
Engine Performance problem
1995 Ford Taurus 6 cyl Automatic 170K miles

Re: 3.8L engine. My car has a PFE sensor attached to a tube, via a hose, coming from the bottom area of the EGR valve. Under the sensor, I noticed some grey chips and I took the sensor off discovered that the chips came from what I describe as a botched repair job. The tubular part of the sensor wasn't there anymore and was replaced by the rubber hose which was connecting it to the EGR valve and was epoxied in and the epoxy finally gave way and disintegrated. I was having a problem with the car in that when I first start up, everything is fine runs good, etc. But when I shut it down and go into a store or something and come out and restart, the car has no pickup and the temp goes up and there is some slight sputting, occaisionally. This had been going on for about a week now and the same thing happens everyday. I did replacel the PFE Sensor with a junk yard purchase and am still getting the same thing. I don't want to invest in a brand new unit yet because of the high cost ($150) until I'm sure I'm looking at the right area. Bob
Do you
have the same problem?
Yes
No
Monday, May 31st, 2010 AT 9:55 PM

38 Replies

Tiny
JACK42
  • MEMBER
I dont really see the sensor doing that, it basically just measures EGR function through exhaust backpressure. Has it ever set a check engine light when it isnt running right? Do the fans come on when the temp gauge goes to hot? Or is it possibly just the gauge spiking
Was this
answer
helpful?
Yes
No
Monday, June 7th, 2010 AT 10:01 AM
Tiny
RSUKOVICH
  • MEMBER
Hi Jack. No, no check engine light and I just finished letting it run to get the temp up and the fan did come on and did it's job. When I first start this thing up in the a.M. You couldn't as for a sweeter running engine and when I stop and restart, the pedal doesn't respond and the temp goes up. I have a "new" rebuilt water pump in, cleaned and put the EGR valve back in. New thermostat (180). If I had to guess at when the problem starts, I would have to say when it hits a certain temperature.
Was this
answer
helpful?
Yes
No
Monday, June 7th, 2010 AT 11:11 AM
Tiny
JACK42
  • MEMBER
When the temp goes up does the fan come on? When you say it has no pick up, is I like it is choking for air? Or possibly plugged exhaust? Will the engine rev up in park?
Was this
answer
helpful?
Yes
No
Monday, June 7th, 2010 AT 10:37 PM
Tiny
RSUKOVICH
  • MEMBER
The fan comes on when the needle is about a 1/4 " away from the red marker. It does it's job and it goes off. No, it doesn't feel like its choking for air. I don't think the exhaust is plugged since I can feel it coming out. There's a hole in the muffler and if I put my hand over the pipe, the exhaust goes out the hole. I compared the exhaust coming out of this car to my 95 Buick and it feels about the same. It does rev up in park. I have a radiator cleaner in it now, but I don't think it's dirty. I just came back from a drive to the store and going over, everything was great, although the temp went to about the middle of the gauge. I started it up and got the same result. If I step on the pedal thinking that I'll get "zoom", I get mush, but when I back off the pedal a bit it starts to pick up. As I continued to go home, the trip got worse and the temp was fluctuating the whoel time, but never went below the middle.
Was this
answer
helpful?
Yes
No
Tuesday, June 8th, 2010 AT 4:41 PM
Tiny
JACK42
  • MEMBER
The middle of the gauge is where they should run (around 200-degrees). Problem for me is defining what you call "mush". But if you back off the pedal a little it will accelerate? You may need to check fuel pressure. Does the coolant level ever get low or is this just the gauge moving around?
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2010 AT 8:10 AM
Tiny
RSUKOVICH
  • MEMBER
As I said before, when I first start in the a.M, the car can't run any better. My first ride amounts to about twenty minutes and I stop to go in a store. I come out start the car up and apply the same amount of pressure to the pedal that I would in the initial start of the day, but I don't get the same reaction, so I call that mush. Maybe spongy would be a better word. I notice that if I ease up on that pressure(because it seems like holding the pedal down retards the acceleration) it starts to pickup but not nearly what I experience in the initial startup. So, by that time I'm on the way home and the car is not running good, few coughs, and dragging, lacking zip and then I have to go up this hill and then the temp goes way up as I climb that hill and after I get to the top and go down, the engine cools some but generally, it stays between the center and the red zone. The coolant level is fine. When I drained to add the cleaner, I had about 12- 13 quarts of liquid and I think that's the capacity. There are no leaks. I replaced the ECT which had a little variance in the resistance test, and it was original equip, but it made no difference. Also have a new fuel filter. I removed and cleaned the EGR valve. I also did a simple vacuum test with a hose and my mouth and the plunger worked OK.
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2010 AT 11:57 AM
Tiny
JACK42
  • MEMBER
Hmmmmmmm. This vehicle may need to go on a scanner to watch what is going on. Since it doesnt set a light (check engine) im leaning towards something mechanical, thats why I asked about exhaust flow.I have seen MAF sensors act like that, plugged exhaust, TPS sensors, Doing the ECT was a good call though, they too will act like this once hot and in closed loop. Check for vacuum leaks around the intake area as well. Would like to know what thefuel pressure is when hot and after having been driven for a little bit as well
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2010 AT 8:19 PM
Tiny
RSUKOVICH
  • MEMBER
I wish a check engine light would come on. The thing that baffles me is why I have that period from the time I start up in the morning that is so perfect and then after it heats up and I restart, I have the problem. Why isn't there a problem right off. It's been suggested by others that the cats are clogged. There is no evidence of that and if they were, wouldn't that be obvious as soon as I start it up in the a.M? What mechanical possibilities are you leaning toward?
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2010 AT 9:20 PM
Tiny
JACK42
  • MEMBER
Fuel pressure would be great to know, still possibly plugged exhaust. Try loosening the exhaust manifolds before the cats and warm it up and restart it to see if it acts the same, jusy to definitly rule that out. Either that or it may need to be on a scan tool like I said to see if all the sensors are working ok, even without the check engine light
Was this
answer
helpful?
Yes
No
Wednesday, June 9th, 2010 AT 10:20 PM
Tiny
RSUKOVICH
  • MEMBER
I'm not prepared to do that since, it's no easy thing to do. I'm convinced that the cats aren't clogged because of the way the car rides so good until it heats up. People that I talk to agree that if the cats were clogged it would show up at the start and not after the car heats up.
Was this
answer
helpful?
Yes
No
Thursday, June 10th, 2010 AT 8:18 PM
Tiny
JACK42
  • MEMBER
OK, if they are partially plugged it will build up backpressure slowly (over running time) until it gets to the point it cant breathe, just trying to definitly eliminate all possibilities. Fuel pressure?
Was this
answer
helpful?
Yes
No
Friday, June 11th, 2010 AT 8:18 AM
Tiny
RSUKOVICH
  • MEMBER
How can I measure the fuel pressure as a layman?
Was this
answer
helpful?
Yes
No
Friday, June 11th, 2010 AT 9:16 AM
Tiny
JACK42
  • MEMBER
With a mechanical gauge. Some auto parts stores have them that you can rent. The schrader valve where you test it will be on the fuel rail
Was this
answer
helpful?
Yes
No
Saturday, June 12th, 2010 AT 9:24 AM
Tiny
RSUKOVICH
  • MEMBER
How about a common tire pressure gage. Also, I need to know what the pressure should be.
Was this
answer
helpful?
Yes
No
Saturday, June 12th, 2010 AT 10:46 AM
Tiny
JACK42
  • MEMBER
Looks like 45-45 psi key on engine off. I have never heard of using atire gauge before, I dont recommend it. The fuel gauge needs to thread on and stay so that the pressure can be checked while running
Was this
answer
helpful?
Yes
No
Monday, June 14th, 2010 AT 8:23 AM
Tiny
RSUKOVICH
  • MEMBER
Haven't had any luck borrowing/renting a suitable pressure gauge yet, but per your suggestion to check for vacuum leak, I hooked up a vacuum gauge at the port on the upper intake manifold and got a reading of 14-15, which I think should be in the area of 18-24, correct me if I'm wrong.
Was this
answer
helpful?
Yes
No
Monday, June 14th, 2010 AT 7:26 PM
Tiny
JACK42
  • MEMBER
It does sound a little low. Is it steady? It wont be in the 24 range idling thats a high vacuum reading like you would get holding amanual trans in gear and letting off.
Was this
answer
helpful?
Yes
No
Monday, June 14th, 2010 AT 10:33 PM
Tiny
RSUKOVICH
  • MEMBER
I did another check on that. It does idle steady at that range and then when I rev up it drops down for an instant and then goes back up and won't go any higher than 16 even if I go higher on the rev. When I finally let it go, it jums to about 20, but quickly settles to the 14-15 area at idle.
Was this
answer
helpful?
Yes
No
Tuesday, June 15th, 2010 AT 1:28 PM
Tiny
JACK42
  • MEMBER
14-15 is the low end of the acceptable spec. Any luck with a fuel pressure gauge?
Was this
answer
helpful?
Yes
No
Friday, June 18th, 2010 AT 8:13 AM
Tiny
RSUKOVICH
  • MEMBER
The consensus of opinions tells me that if the fuel pressure was low or bad, that I would experience problems continually and not on a basis that my car is experiencing now. I'm leaving this forum on this problem and will seek help or advice elsewhere. Thank You. Bob Sukovich

updated 7/1/10
I was able to get a combo vacuum/fuel pressure gage and checked both. The fuel pressure went to the top of the scale and the vacuum checked out at 17-17 1/2 contrarty to the 14-15 that I got with my old gage. My last message indicated that I was going to go to other sources and post my problem there and one of the replies that I got from a member that it sounded like my engine was "eating a head gasket". There are absolutely no indications that I have a head gasked problem; no water in the oil (discoloration), no change in color on the oil filler cap or the rad cap. So, as my young son, at the age of 6, once told me as he wandered further from the house, "I am getting loster." Regards, Bob
Was this
answer
helpful?
Yes
No
Saturday, June 19th, 2010 AT 11:00 AM

Please login or register to post a reply.

Recommended Guides