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Old 02-22-2014, 09:59 PM   #1
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Won't start!

I need help, a little while ago my 98 GT sometimes wouldn't start on first crank. I'd crank it again and it was fine and ran good. Then one day it wouldn't start at all. I replaced fuel filter and pump, plugs and wires, good battery, I have good air and fuel so idk. The other day it actually ran for about 5 seconds then died. During some cranks it wants to start, any advice or useful checks I can do are appreciated.
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Old 02-22-2014, 10:51 PM   #2
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Will it start if you step on the gas pedal a little when you crank it over?
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Old 02-23-2014, 12:10 AM   #3
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Nope I tried that and it makes no difference at all.
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Old 02-23-2014, 12:24 AM   #4
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Well, an engine needs four things to run. Compression fuel, air and spark. It seems like a fuel problem from what you describe. Are you positve that the fuel pump is coming on? Also, verify that there is spark.
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Old 02-23-2014, 06:26 AM   #5
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I replaced the fuel pump and I hear it come on when I turn the key. I've seen a spark plug spark but haven't checked them all. Maybe I should do that next...
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Old 02-23-2014, 06:17 PM   #6
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how about your IAC? They're only $50 from Autozone. Make sure yours is clean and not really old...
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Old 02-23-2014, 06:18 PM   #7
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Already replaced the IAC a couple months ago.
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Old 02-23-2014, 06:24 PM   #8
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I heard somewhere that the wires can get weird sometimes from the tilt wheel. They say be careful moving it up and and down so the wires don't frey or become loose. Someone took the cruise control out of mine. Maybe it had problems. IDK why but someone did something in my Steering wheel wiring..

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Old 02-23-2014, 07:00 PM   #9
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Hmmm I'll fiddle with the steering column next time.
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Old 02-23-2014, 07:10 PM   #10
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Sounds like your headed down the right path but check the alternator. Battery only provides voltage to start the vehicle and complete the circuit, alternator keeps the car running. Should put out 14volts. Could be the culprit if the car won't run.
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Old 02-23-2014, 07:41 PM   #11
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One more thing. Nuetral Safety switch. I hope it's not the last two things i posted. just two little culprits I heard similuar stories.. Good luck

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Old 02-24-2014, 01:33 AM   #12
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I didn't even think about the alternator, good idea. Do you know where I check for voltage? I have a multimeter.
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Old 02-24-2014, 01:43 AM   #13
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I didn't even think about the alternator, good idea. Do you know where I check for voltage? I have a multimeter.
You won't be able to test it if the car isn't running. You can take it off and bring it to an auto parts store for testing though.
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Old 02-24-2014, 01:47 AM   #14
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4.6 car?
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Old 02-24-2014, 01:51 AM   #15
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Sorry, it's a GT. I wasn't paying attention. Looked in the area of the crank angle sensor ( crankshaft position sensor )? Had those fail countless times.
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Old 02-24-2014, 01:54 AM   #16
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Also, may as well check for any codes while you're at it...
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Old 02-24-2014, 06:58 AM   #17
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Yeah I'll take it in for testing since it's easy, and the check engine light wasn't on when it was still runnin. I'll look into that sensor though, haven't considered that. I replaced coil packs today (they were getting corroded anyways) and it's like the second there's any combustion it dies.
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Old 02-24-2014, 08:33 PM   #18
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Got the alternator benched checked, it was fine. Worth a try though.
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Old 02-24-2014, 09:03 PM   #19
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I would try another IAC just in case you have a defective one. Something in there. its easy enough. I got bad parts before. Also. You think maybe its a cracked spark plug? simple things to check out. IMO.. (this kind off stuff drives me crazy)

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Old 02-24-2014, 09:07 PM   #20
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I had a bad starter solenoid and the symptoms were similiar to yours. I went over every wire and hose connection 3 times after my PI swap. I found and fixed a couple connections. Keep checking the easy things that don't cost money.

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Old 02-24-2014, 09:58 PM   #21
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Quote:
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I would try another IAC just in case you have a defective one. Something in there. its easy enough. I got bad parts before. Also. You think maybe its a cracked spark plug? simple things to check out. IMO.. (this kind off stuff drives me crazy)

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OP has mentioned that opening the throttle manually didn't solve the issue, so IAC wouldn't be suspect in that case.
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Old 02-24-2014, 10:00 PM   #22
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OP, the starter is spinning, correct?
Just won't fire up?
Foot on the gas pedal slightly makes no difference, right?
You hear the fuel pump priming up the system for a few moments when the key is turned to the run position, right?
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Old 02-24-2014, 10:07 PM   #23
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Is it manual????
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Old 02-24-2014, 10:23 PM   #24
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I had a short in my solenoid. It took 6 months before my starter completely went. It was a short in the solenoid. A new starter solved my eletrical issues. The ignition wire goes thru the solenoid. But our starters are hard to get to. I'm thinking you have a bad connection somewhere along the line. especially if you're getting fuel, spark, combustion. Something isn't flowing properly thru your ignition keeping it from running. I didn't throw any codes with an electrical short either. Total shot in the dark. But I think your problem is bizar and out of the ordinary. Simple as heck too. Just gotta get lucky and find the bad connection.

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Old 02-24-2014, 10:27 PM   #25
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We're trying to get the OP to verify the symptoms so a more accurate diagnosis can be made. I know we are all here to help, but throwing random ideas at the OP is not getting anyone anywhere unless we can get factual symptoms.
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Old 02-25-2014, 12:21 AM   #26
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OP, the starter is spinning, correct?
Just won't fire up?
Foot on the gas pedal slightly makes no difference, right?
You hear the fuel pump priming up the system for a few moments when the key is turned to the run position, right?

Everything you said here is correct. And it actually started and ran for 5 seconds on its own once.
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Old 02-25-2014, 12:28 AM   #27
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Although my IAC was a cheapie from Rock Auto, I don't think that is the problem. It idled like a champ before it died. I'm gonna post a vid of me tryin to start it.
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Old 02-25-2014, 05:13 AM   #28
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Well I can't post vids on here, but there's a brief sound of hope with each crank. It makes me want to keep cranking. Would it run if just one of the cylinders didn't spark? I've only checked 2 cylinders for spark.
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Old 02-25-2014, 05:31 AM   #29
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Yes, it will run if one cylinder loses spark.
It is not your IAC
It is not your starter
It is not your solenoid.
It is not your battery.
It is not your alternator.
It is not your neutral safety switch.
Stay out of the steering column wiring harnesses for now.

Next, check for fuel pressure. On the drivers side of the engine, unscrew the car on the service port of the fuel rail. Looks similar to a tire valve stem cap. After the ignition has been cycled to the run position, GAURD YOUR FACE, and depress the valve inside the service port. If you own a fuel pressure gauge, then do it that way, which is safest, and determine that you do or do not have adequate fuel pressure. I understand that the pump is new, but new parts fail, and though you can hear it run, it may not be delivering adequate fuel pressure. Fuel should try to hit the bottom of the hood if youre doing this test without a fuel pressure gauge.
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Old 02-25-2014, 06:20 AM   #30
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I'm sorry, I thought he checked for fuel pressure. He replaced the fuel pump. I'm gonna stay out now.

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Old 02-25-2014, 07:06 AM   #31
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Huge update, I hooked up a fuel pressure test gauge to the rail and got less than 10 psi so it's definitely a fuel issue. I did this before but I was watching the gauge from inside the car and didn't notice it move. I already changed the pump and filter though, wtf.
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Old 02-25-2014, 08:25 AM   #32
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carefully check the vacuum line at the fuel pressure regulator. see if theres gas in it or if it smells of gas.

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Old 02-25-2014, 08:51 AM   #33
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Thanks Mos but I think Olds is on the right track. When I depress the schreader valve on the rail fuel just drips out, very weak pressure. I'm gonna drop the tank tomorrow and stop assuming that just because I hear the pump running that it's supplying pressure. I also just pulled the filter but clean fuel poured out. And cleaned the spark plugs off. This car is a nightmare, you give it your all and you don't even get the satisfaction of driving it lol.

---------- Post added at 09:51 AM ---------- Previous post was at 09:50 AM ----------

I thank you all for your help though, you've kept me going.
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Old 02-25-2014, 08:54 AM   #34
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Thanks Mos but I think Olds is on the right track. When I depress the schreader valve on the rail fuel just drips out, very weak pressure. I'm gonna drop the tank tomorrow and stop assuming that just because I hear the pump running that it's supplying pressure. I also just pulled the filter but clean fuel poured out. And cleaned the spark plugs off. This car is a nightmare, you give it your all and you don't even get the satisfaction of driving it lol.

---------- Post added at 09:51 AM ---------- Previous post was at 09:50 AM ----------

I thank you all for your help though, you've kept me going.
any time it's just a Mustang. you'll get it .

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Old 02-25-2014, 09:14 AM   #35
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Process of elimination works wonders
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