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Ford Taurus 95′ v6 3.0 SOHC New to me… will only crank using starting fluid. then runs smooth
I have done a lot of diagnostics on it( i have fuel and vac gage kits and meters) Im no spring chicken when it comes to cars… PLEASE HELP
My original posting here
I cant seem to get the codes to flash…ive done it by the book and online vids…but nothing
There is fuel pressure, 40psi, when KOEO and 34 after Started with either. And runs pretty smooth for 150k. the spark plugs are clean and gapped. I replaced the fuel pressure reg and inline filter.
One thing that is nagging me is that the fuel pressure dose not jump up by 10 as the book says it should when vac line is remove…it some time jumps by 5 bt some times not at all.
Vacuum is with in range and is close to being steady. Im not sure about the EGR valve…. that vac line has very little pull on it. When i pull vac by hand pump on the EGR, the rmps go way down. Is this normal?
What bugs me is how can the engine start with starting fluid by not by the cars fuel, bt yet run good on it after it is started.
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fuel pressure has to jump up when the vac line is removed
on the FPR. sounds like the FPR is faulty.
You could have FP and not volume. Is there a return line
you can pinch off to see if fuel pressure goes up?Yea… Ii did this test… I replaced the FPR with a bran new one, no change. Some times it jumps up by 5 but sometimes its no change…. What the chances the new is faulty?
[quote=”shadetreemechanicnotree” post=123979]Yea… Ii did this test… I replaced the FPR with a bran new one, no change. Some times it jumps up by 5 but sometimes its no change…. What the chances the new is faulty?[/quote]
Its a good possibility. Does fuel pressure drop off when the car
is off or does it hold where it was?[quote=”shadetreemechanicnotree” post=123980]The fuel pressure very slowly drops off….over a 20 min period… I figured this is normal. Is it[/quote]
It should drop 5-7 psi no more. If its dropping off then FP is suspect.
Is the a return line you could clamp off. This will tell you if the regulator
is leaking or the fp.If you still have the FP tester. You can take a jar and crank
the engine a half pint of fuel should fill in approx 15 seconds.Ive found that if i Hang my FP gauge up it gives better readdings….i think the readings are now a bit suspect to at or near min.
So i had the car cut off for 20 mins now, not much leak down….may 3psi
the return line is a hard plastic line covered by soft hose… will pinching off this hose dammage it?
[quote=”shadetreemechanicnotree” post=123989]i’ll try that soon….[/quote]
Keep us posted on your progress. 🙂
any chance you have the fuel filter on backwards? What happens if you cycle the key from off to run about 5 times then try to start? Sure there is no leaks at all? Coolant temp sensor reading correctly? You say the fuel pump wines in and out I believe you have a issue with the fuel pump assembly.
Filter is on right..with arrow to front. Ill try the cycle of key on – off, The coolant temp sensor may be defective as the temp gauge does not move,
I have suspected the FPump from the beginning but with 40 psi at key on and 32-34 when running and 160 bucks replacement, I have tried to find another issue….
During a cold start the PCM would get a signal from the ect to retard the spark timing and run the engine’s fuel mixture slightly richer to help compensate for cold conditions. It is possible that the coolant temp sensor is not reading right and that is your issue with starting when cold. look into this first.
I would only pinch a rubber hose.
At start the computer knows air in and only assumes fuel pressure is correct. The computer commands open the injectors the amount of time to release the correct amount of fuel at that assumed correct pressure. If pressure is not correct the injectors produce a different than correct amount of fuel causing the engine to not achieve a correct mixture for start. Since you can start the engine with starter fluid I guess pressure is low.
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