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Ihaveanewtempo
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Post subject: Ford Tempo Running Rich
 Posted: Apr 18, 2012 - 04:01 PM
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Member
Joined: Feb 03, 2012
Posts: 30
Status: Offline
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| Without even checking it with a tool i believe my tempo has a problem with its fuel pressure. The car runs rich, and with the a/c on the engine does not run smoothly. I am self diagnosing that the fuel pressure regulator is bad. Have any of you had any experience with that. The part is only 17 dollars, so i might as well. Ideas? |
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Ihaveanewtempo
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Post subject:
Posted: Apr 18, 2012 - 07:09 PM
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Member
Joined: Feb 03, 2012
Posts: 30
Status: Offline
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| Just bought a throttle position sensor, fuel pressure regulator, throttle body cleaner.. all for under 35 dollars. these parts are cheap enough i might as well change everything haha.. |
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Psychopete
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Post subject:
Posted: Apr 18, 2012 - 09:12 PM
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Moderator
Joined: Sep 08, 2010
Posts: 148
Location: Fort Wayne, IN
Status: Offline
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| You really should check up with diagnostic tools. Fuel in the vacuum line of the FPR is dead give away it's bad, but it depends on how it has failed. Fuel pressure tester is about $40, and you can pull codes for free. Vacuum leak can cause rich mixture, o2 will sense the extra oxygen and run it richer to try and compensate. Just depends, really should diagnose instead of buying parts first. Going to replace a bunch of things that may still have plently of life left in them. Fuel pressure tester works for all kinds of vehicles, and I can guarantee you that it won't be the only time you use it. I rarely use mine, but it's sure helpful when diagnosing problems. If the problem hasn't been narrowed down to fuel, mechanical, or eletrical at this point, there is still a ways to go yet. |
_________________
1993 Ford Tempo 2.3L HSC Auto (Green)
1988 Ford Ranger 5.0L AOD
2002 Dodge Caravan 3.3L Auto
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Ihaveanewtempo
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Post subject:
Posted: Apr 18, 2012 - 10:22 PM
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Member
Joined: Feb 03, 2012
Posts: 30
Status: Offline
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| The thing is i have no check engine light. There is no code to read. The only time a check engine light appears is after the car stalls, but as soon as I start it up again the code is gone. Can the code reader read the code with the engine off? This is a very weird problem as the car idles fine. The car stalls when you barely apply gas to the engine. If I step on the gas normally, the car will move. Because of this i thought it could be the throttle positioning sensor. I have already replaced all the vacuum lines as i thought it might be a vacuum leak, but to no avail. Another interesting thing to note is after the car stalls, it take the engine longer than usual to start up, even longer than it would if the car has been sitting for a week. I don't believe this has anything to do with temperature as i can make the car stall when it is hot/cold. I really believe it is a fuel pressure problem as the car. There is no fuel in the fuel pressure regulator vacuum line Thanks for the reply i really appreciate it. |
Last edited by Ihaveanewtempo on Apr 18, 2012 - 11:36 PM; edited 3 times in total
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Ihaveanewtempo
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Post subject:
Posted: Apr 18, 2012 - 10:24 PM
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Joined: Feb 03, 2012
Posts: 30
Status: Offline
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| The car is a 1991 Ford Tempo L regular 2.3L engine |
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amc49
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Post subject:
Posted: Apr 19, 2012 - 02:49 AM
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Blabbermouth
Joined: Aug 07, 2009
Posts: 1055
Location: Fort Worth, Texas
Status: Offline
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If fuel supply/pressure problem then should run worse as you merge on freeway under power. That would be LOW pressure. Too HIGH pressure can only be regulator and nothing else. If that was changed then it's not a HIGH pressure problem.
Yes, on these earlier cars often a code can be posted in PCM without posting a CEL. Called a pending code, i.e., the PCM has not decided to flag it as a true problem yet. It does keep record of it though.
You can change 5 million parts based on intuition and be dead wrong on modern cars. I watched it all day long with people who were firmly convinced they were on the right track but later proved wrong. There is no substitute for the sometimes simple testing needed to fix these. Problem is that 15 different things can make your exact symptoms. If the car truly running rich you'd show an O2 code for that.
The check engine light can be used to read those pending codes. They can be read engine on or off. |
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reverser514
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Post subject:
Posted: Apr 26, 2012 - 03:38 PM
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Member
Joined: Dec 27, 2010
Posts: 112
Status: Offline
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| Dont just throw parts in your car. its not worth it. take the time to properly diagnose it and then you only have to buy one part. |
_________________
1990 Mercury Topaz GS - Red
2.3L Inline 4 HSC ATX VIN X
"Captain Morgan"
Member Since December 2010, Found forum just two days after I got my car 
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