Why is it everytime when i start my 89 f-150 4x4 5.0L does it idle high on choke like it should but after its warms up enough it chugs a little then it dies is it anything to do with the fpr sensor


Asked by Jan 12, 2015 at 09:56 PM about the 1989 Ford F-150 XLT Standard Cab 4WD SB

Question type: Maintenance & Repair

If i can't run a vacuum or a fuel
pressure test how do i know if the
injectors are good or bad or if there
are any vacuum leaks if anyone has
the tools to test this and mite be
willing to run the test let me know

13 Answers


is there fuel present in the fuel pressure regulator's vacuum line now when the engine is run? Has your fuel pressure regulator, an engineering number from ford on it ? You might run the oasis on it tomorrow by calling your dealer and reading them your VIN and your engineering number prefix for the FPR. They are kinda difficult to get at. it would be worth it if you had some help there, does not hurt to ask.


Your ford is computer controlled. Run a self test diagnostic and count the check engine light flashes before you go out and do any thing else. You'll need a piece of wire to ground out the EEC plug on the driver side fender under the hood. Just look up, "EEC IV Self Test" on the internet. Then all you do is turn your key on and any codes stored should start to flash. In my opinion your problem is not going to be fuel but a sensor such as the Throttle Position Sensor, "But I could be wrong with out checking for codes."


After you find any possible fuel leak issue exists? internal, that makes it die out or smoke, or foul plugs eventually? check the possibility of fuel in the engine oil. Having fuel getting into the oil pan means change it, and the filter immediately. if you know this is happening, refrain from cranking and starting till you have the correction and the service. it can be a fire .or worse.


Since NHTSA saw fit to safeguard these trucks with a safety recall, you can see why it must be checked and eliminated as a possibility. That does not necessarily mean it cannot still be a leaking FPR. The gauges for these tests you may want to run are very inexpensive at harbor freight. The other tests for FPR require the gauge.


I had a guy that worked at gm for 30 plus years look at it and he said there's no fuel in oil or nothing internal once it gets warm it'll run fine but gotta stay on gas until then


Its just a very cold blooded truck but i only paid $350 for this truck aexcept th few weeks ago but everything works except

1 people found this helpful.

The thermostat guage on dash still can't figure that out either just put new thermostat in it but that didn't make it work either minor things but i like my things to run perfect


The $350 perfect running truck with out standing recalls and runability symptoms that vascillate like it must have california emissions. ! oh, and GM techs help you but do not posess diagnostic tools, oh, and they know the internal conditions, allright, sounds like some cars i have had. Did you name her yet ?


The answer to your original question is to take a page from robert bosch's books. Remove your injectors and while they are connected still to the rail, aim them into a pan and operate them to check the pattern, then shut them down, and watch them drip. Happy testing !


Test your coolant temp sender.


Get a thermometer from your momma and measure your coolant temp. Run your service codes. 2 digit codes can be googled or enginecodes.com. Anymore self reversing symptoms, you have to read how the system works and put it in the condition for testing, then run the pinpoint tests. The service manuals for old F-series were donated by dealers to public libraries. If there was a reference library where you live, you could go read up on it like I did as an apprentice. you can start believing some of the books again after 87. (H manual)


Y'kno, if you have to open the throttle till it warms up or it runs poorly and dies? does it still have that symptom? Then it would foul your Hegos and melt the catalyst. You might get a used ECT ACT and clean the EGR. since you dont have a DVOM.


Check for Codes....

Your Answer


Looking for a Used F-150 in your area?

CarGurus has 215,477 nationwide F-150 listings starting at $1,300.


Ford F-150 Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used GMC Sierra 1500
722 Great Deals out of 58,462 listings starting at $1,900
Used Ford Mustang
270 Great Deals out of 37,082 listings starting at $2,150
Used Ford F-250
401 listings starting at $2,300

Used Cars For Sale

2018 Ford F-150 For Sale
79 Great Deals out of 138,368 listings starting at $17,895
2017 Ford F-150 For Sale
144 Great Deals out of 10,171 listings starting at $19,499
2016 Ford F-150 For Sale
213 Great Deals out of 8,805 listings starting at $14,500
2015 Ford F-150 For Sale
280 Great Deals out of 10,501 listings starting at $11,990
2014 Ford F-150 For Sale
414 Great Deals out of 11,726 listings starting at $7,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.