Help with Diagnosis

[GMAN]

I picked up another Mark yesterday. I was under the impression that the motor was bad. It may very well be. I just turned it over and the engin won't stay on without help. As long as I give it gas it will start. Soon as I let of the gas it dies immediately. If I turn the key to start it it just turns over as if it's starved of gas. I am leaning towards a bad fuel pump. Any thoughts?

 

[87TTOPGT420]

check fuel pressure...38-40psi

is there coolant in it? how's the oil? gen 1 or 2

 

[chris2523]

IAC could be stuck shut.

 

[GMAN]

The car is a 98. It's been sitting a year. When the previous owner parked it a year ago. It was having issues so they parked it.

 

[brentalan]

+1 sounds like IAC

 

[chicken]

+3 id start simple iac

 

[87TTOPGT420]

ya for the 30seconds it takes it would be the first thing I'd do...on a gen 1 I'd do some more basic diagnosis first

 

[GMAN]

That's good to know. I will be getting one in addition to an oil change and plugs. So a bad IAC will give the illusion of the car turning over without starting?

 

[87TTOPGT420]

yes if its stuck closed it won't allow air in so it can fire

 

[brentalan]

My friend has an 01 Mustang GT that had the exact same symptom. She had to hold down the gas to keep it running. I replaced the IAC for her and the problem was gone.

 

[96_Lincoln_LSC]

Since on a Gen2 the IAC is right on the top of the Throttle body on upper intake, its a very fast check. and I do believe this is one of the more common failures for hard start/Rough Idle.

 

[ONLYTONY]

My 97 at a light went from 750 rpm's to about 400 and almost stalled. Did this twice so I change the IAC and all is well again.

 

[ONLYTONY]

+1 for the IAC Clogged air filter,dirty MAF or mouse in the way of air flow

 

[GMAN]

Well the good news is I change the IAC and the car started right up. The bad news is it has a knock coming from the passenger side head.
[video=youtube;I3BS_xsO5g8]http://www.youtube.com/watch?v=I3BS_xsO5g8&feature=youtu.be[/video]

 

[chris2523]

dang. that's loud.

 

[GMAN]

It is loud. I'm thinking i need to get another motor.

 

[Right on the Mark]

You most likely spit off one of the primary intake rockers? I would have that VC off in sec to poke around.

 

[87TTOPGT420]

yup for sure that cover would be off in no time if it was me

 

[GMAN]

OK, I'll poke around tomorrow. It's a bit hot now. So it can possibly something minor?

 

[Right on the Mark]

OK, I'll poke around tomorrow. It's a bit hot now. So it can possibly something minor?

If your lucky it did what I said and its laying there getting whacked by the cam. Pop it back in and go , if its that. I'm gonna be the glass half full guy here. LOL

 

[My Great 8]

How about some pics of the rest of the car Greg?