car cranks 5-7 revolutions before starting

R

rockyracoon

10 Year Member

Nov 23, 2005

874

27

49

margate NJ

Mar 24, 2006

#1

• Mar 24, 2006

• #1

I cant seem to figure out why.car has full tune up,plugs set at 0.54 timing@14 deg spout out,no codes in memory or running ,passed cyl balance test,good uniformed compression.Im thinkin that this may tie into my not so good MPG and the somewhat gassy smell when it first starts.I pulled the vac line off of the FPR thinking that there would be some gas in the line but there wasnt.BTW the plugs looked fine,really clean.but It seems like too much fuel is entering the chambers.could it be the fuel pump or the regulator,or a leaky injector?BTW also cleaned Mass air and set tps.

 

Jaswir

Member

Mar 31, 2005

578

0

18

Orlando, FL

Mar 24, 2006

#2

• Mar 24, 2006

• #2

might be the fuel pump... if its taking 5-7 revolutions to crank over... when u turn the key on does ur fuel pump prime??

 

95GTV8

New Member

Jul 25, 2005

386

3

0

Washington State

Mar 24, 2006

#3

• Mar 24, 2006

• #3

i've got the same problem, although mine is more random. Sometimes she starts up very nicely and sometimes it takes along time and it sort of sputters to life. I just changed the fuel filter, so do you think it could be the fuel pump?

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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129

Mar 24, 2006

#4

• Mar 24, 2006

• #4

Cycle the key on and let the pump prime. THen turn the key off and repeat. Do this a time or two before starting for the first time and see how it starts.

I think you made a typo - plugs go in a 0.054".

Good luck.

 

R

rockyracoon

10 Year Member

Nov 23, 2005

874

27

49

margate NJ

Mar 24, 2006

#5

• Mar 24, 2006

• #5

mine never sputters,it just routinely cranks that many revolutions before it kicks.Oh yeah Hissin50, 0.054.But my prob seems like too much fuel cause like i said when it first starts up you can smell gas.could a bad pump deliver too much or would that be a regulator?.anyone know the proper procedure to check the pump and regulator.I have a gauge to check the pressure, just havent used it yet.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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129

Mar 24, 2006

#6

• Mar 24, 2006

• #6

One should see 30+ PSIG of fuel pressure with the vac line attached. At simulated WOT (vac line removed) you should see 38-39 PSI.

If you have stock injectors, you shouldnt have too much cranking-fuel. Guys with the fat squirters (read 30# on up, generally) might have too much cranking fuel and tune some of it out.

It sounds like you still run cats, right? Otherwise the fuel smell is kinda normal.

FWIW, flooring the gas pedal while (AND ONLY WHILE) cranking cuts the injectors. This would be a means of testing your 'too much fuel' theory (I dont think this is the case, and the fuel smell is a result of another issue. The fuel smell comes from extended cranking). But you know best - you are there experiencing it. I just try and convey my thoughts from a keyboard, which is like me commenting on your golf swing from my computer.

Good luck.

 

90mustangGT

I felt sorry for girls because

Founding Member

Jan 15, 2002

2,773

17

89

Dallas, GA

Mar 25, 2006

#7

• Mar 25, 2006

• #7

My camaro does this. I checked fuel pressure and it primes fine, but as soon as if finishes priming, the fuel pressure dropps off fast, it should hold. I am ordering a new fuel pressure regulator because they are cheap and commonly go bad on GM's, but I dred the fuel pump on that thing. (F-body gas tank, the differential is in the way) GM, Ford, Chrysler, they all use the same fuel system and parts. So check the fuel pressure and see what it does. It could be bad compression as well, but lets hope not. Also, check the TPS voltage.

 

rd

Founding Member

Jan 12, 2000

3,316

63

109

Ocean Springs MS

Mar 25, 2006

#8

• Mar 25, 2006

• #8

This is what Ford calls an extended crank.

One potential cause is the check valve in the fuel pump fails and as soon as the car is off, the fuel pressure drops to nothing. It takes that much time for it to build back up when you start the car.

If possible, put a fuel pressure gage on it. If it is fine with the car running, but drops immediately when you turn it off, the fp check valve is a good bet.

Its part of the pump so you have to change the pump.

 

R

rockyracoon

10 Year Member

Nov 23, 2005

874

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49

margate NJ

Mar 25, 2006

#9

• Mar 25, 2006

• #9

Oh ok so I gus the check valve is stuck open.Im gonna take a f/p reading tonight and see where I stand.thanx fellas.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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129

Mar 25, 2006

#10

• Mar 25, 2006

• #10

The FPR can also be responsible for a pressure drop as soon as the key is turned off.

Carefully crimping the return line with fuel injection line crimps at the same instant as turning the car off can help narrow things down.

Good luck.