Hard to start - plume of smoke on start up - shake

06monera96

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Hello everyone,

Been having some minor hick ups with my car lately. ( Since last Friday )

Car has been having a hard time starting up, some taking up to 3-5 seconds of cranking to catch it self, starve of fuel and idle properly.

Once idling my a/f would read 13.2 and slowly make it way up to 14.8~15

I notice one thing so I installed a mechanical gauge.

When I Key on, the pump primes pegs to 70~80 psi
Drops down to 40 and slowly dies to 0.
Prime time is about 2 seconds where I guess it see's maximum pressure and shuts off.
But is the fuel rail suppose to drop to near 0 psi b4 I even start cranking? or is my fuel bleeding away somewhere?

So far, someone suggested bad pump, local tuner suggested bad injector.

Anyone ever had this issue before?
 

slackinoff

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Yea if the smoke is gray then I would definitely think you have an injector bleeding down pressure causing 1.) All the other injectors starved 2.) One cylinder extremely rich. I would pull the rails really quick and do a ignition cycle key on.......you will find out if an injector is leaking!!! Be careful. Have an extinguisher handy....just saying.



Rm

Instagram account: "Probuildmustangs"
 

07 Boss

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That beginning fuel pressure seems high. Mine gets to about 40-45 psi before I crank the starter. If you have almost double the pressure it is dumping almost double the fuel it needs. Try putting the pedal to the floor before you start cranking and then let off while continuing to crank. It doesn't solve the problem but it may make it start a little easier.
 

JeremyH

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My first though is stuck injector(s) as well. Is there anymore information or did it just start happening as you have been continuously using the car?

Prime pressure is good, and no it should not drop like that to zero should take a day for the pressure to bleed to zero if you stop cranking and don't start.
 

slackinoff

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4 bolts and 5 min and you can have the injectors laying on the side of the engine. Find out man.
 

06monera96

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4 bolts and 5 min and you can have the injectors laying on the side of the engine. Find out man.

I wish it was that easy
:p the car has a M90 supercharger unit.
The 6 bolts at the back of the blower are not easy at all to get to.

Trust me if it was stock, I would of swap it a while ago.

I have 16 more injectors to play with...
I bought a few set since there no real other size out there
(Supershorties)
 

slackinoff

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Damn it's that hard with the m90 kit to the injectors huh? So it sounds like you have a couple of other sets to try out?
 

JeremyH

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As long as you have rail clearance (there are different versions of the 3v m90 kit some has intake on driver side other were passenger side) You can use rail spacers to run a standard short 48mm/gt500 height injector vice the 39mm compacts or super shorties as you called them.
 

06monera96

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Damn it's that hard with the m90 kit to the injectors huh? So it sounds like you have a couple of other sets to try out?

Yup, bought a set because I thought my injectors were poached due to a lean condition on tip in.
Ended up being the tuner not properly done.

Now i have basically 16 more injectors just laying there.

Going to try swapping out the 4 on the driver side for now.
The elbow is blocking the passenger side. and hopefully, its 1 of the driver side injectors leaking.
 

slow06stang

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A friend of mine and myself had the same issue. He had a Roush Classic and mine is Procharged, we narrowed it down to our tuner. We both had to do the force flood to get them to start occasionally.
 

06monera96

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From what Lito told me, must be a bad check valve in the pump.
There no way all the fuel would have leaked down into the cylinder or would of caused hydrolock
 

06monera96

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Well, Lito was correct.

Check valve on the pump failed.

The replacement pump was already in stock in my garage.
Replaced it (y) we back in business.
 

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