No start when hot... any ideas?

astras · February 21st, 2009, 07:32 PM

OK, so the car will start up great when it is cold. Idles fine, revs good. If I let it sit running for a while, and shut it off it won't restart again.

Stock 302 w/ E303

Things I have tried/checked:

- Replaced the ECT
- Replaced the TFI module
- Have spark
- Timing is good
- Fuel pump makes the "hum" when you turn the ignition on

Only thing, is when I turn the motor over when it is hot and I press the release on the Schrader valve not much fuel comes out. I am going to get a pressure gauge tomorrow to check it out.

The other thing, when I put the engine back together I had gotten a little bit of gasket sealer on the ground strap. The first few times I fired the motor, it was very sluggish and the negative battery cable started to smoke.

I don't know what I might have fried (if anything) but it doesn't make sense that it fires right up like there is no problem if it's cold.

Any suggestions?

89LX347 · February 21st, 2009, 07:47 PM

does it turn over when its hot? could be your starter. go back, if you havnt already, and make a good ground connection.

astras · February 21st, 2009, 07:48 PM

It turns over fine... doesn't even attempt to fire though. Starter is good.

Nice 5.0 · February 21st, 2009, 09:36 PM

If your getting spark the problem is on the fuel side. Check fuel pressure. If fuel pressure is good you need to see if you have injector pulse. Basically use a test light and probe the wires at the injector connection. Crank the motor over and the test light so pulse at a rapid rate. Make sure you check this when the car won't start. If you dont have a pulse then it's time to troubleshoot. That's where the fun begins. Luckily not much stuff to check on the fuel injection side. It could be a bad injector, sensor or computer. I've seen a bad TPS sensor cause the same problem. That should get you started.

93mustank · February 21st, 2009, 09:58 PM

TFI's dont like the heat.......................

JohnC · February 21st, 2009, 11:27 PM

Check the TPS, IAC, EGR, and coolant temp sensor?

88stang · February 21st, 2009, 11:51 PM

Originally Posted by astras

OK, so the car will start up great when it is cold. Idles fine, revs good. If I let it sit running for a while, and shut it off it won't restart again.

Stock 302 w/ E303

Things I have tried/checked:

- Replaced the ECT
- Replaced the TFI module
- Have spark
- Timing is good
- Fuel pump makes the "hum" when you turn the ignition on

Only thing, is when I turn the motor over when it is hot and I press the release on the Schrader valve not much fuel comes out. I am going to get a pressure gauge tomorrow to check it out.

The other thing, when I put the engine back together I had gotten a little bit of gasket sealer on the ground strap. The first few times I fired the motor, it was very sluggish and the negative battery cable started to smoke.

I don't know what I might have fried (if anything) but it doesn't make sense that it fires right up like there is no problem if it's cold.

Any suggestions?

I'm curious? Is your car a standard shift and if so will it start if you try to push it off? I too experience the starting issue when the car has reached normal operating temp. I have had no luck solving this issue.

NeverEnuff · February 22nd, 2009, 12:00 AM

OK. Here we go. I am 3 for 3.

Get a new computer or new tune. Your warm start side of the tune is bad. I am willing to bet ANYONE WHATEVER that your computer is at fault. Get a new computer and it WILL fix your problem....period.

Edit:

I have been through this...and THIS...and ONLY this is the reason why I am into modulars...

NeverEnuff · February 22nd, 2009, 08:36 PM

Any luck?

mustanginky · February 22nd, 2009, 08:40 PM

i've had this issue before on my old 5.0 and my timing was off. but you say yours is good so...

astras · February 23rd, 2009, 09:21 AM

Well, no luck yet. The funny thing is, you have ONE CHANCE to start the car. If you shut it off and try to restart it, it attempts to start. If you miss that chance, it won't start again until I do one of two things:

- Either wait til it's cold or
- Plug in my code scanner. All I have to do is plug it in. Don't even have to turn it on. The car will fire right up.

No 'effing clue. This is driving me nuts.

zack065 · February 23rd, 2009, 09:29 AM

Originally Posted by NeverEnuff

OK. Here we go. I am 3 for 3.

Get a new computer or new tune. Your warm start side of the tune is bad. I am willing to bet ANYONE WHATEVER that your computer is at fault. Get a new computer and it WILL fix your problem....period.

Edit:

I have been through this...and THIS...and ONLY this is the reason why I am into modulars...

i see this working

superbean · February 23rd, 2009, 09:34 AM

high resistance, heat, burnt ecu trace possibly.

haywood11 · February 23rd, 2009, 10:43 AM

if it shuts off when its hot and fires up when its cold i would check the ignition control module.........

grnstang · February 23rd, 2009, 10:46 AM

is it possible the starter is at fault? heat soaked?

haywood11 · February 23rd, 2009, 06:58 PM

any takers on what i said?

grnstang · February 23rd, 2009, 08:14 PM

actually yes that could be what it is too. i didnt read your post before.

NeverEnuff · February 23rd, 2009, 08:21 PM

Originally Posted by astras

Well, no luck yet. The funny thing is, you have ONE CHANCE to start the car. If you shut it off and try to restart it, it attempts to start. If you miss that chance, it won't start again until I do one of two things:

- Either wait til it's cold or
- Plug in my code scanner. All I have to do is plug it in. Don't even have to turn it on. The car will fire right up.

No 'effing clue. This is driving me nuts.

My 91 did this exact SAME thing! 1 shot...if you didn't touch the gas just right, it wouldn't start...

Swap out your ECU.

NeverEnuff · February 23rd, 2009, 08:21 PM

Originally Posted by haywood11

if it shuts off when its hot and fires up when its cold i would check the ignition control module.........

It isn't that...

I love it when ppl don't listen.

Not directed at you...buuuuuuuttttt...

What I see here are a bunch of 'guesses' at what is wrong with his car. Try this, try that. I pulled my hair out for over 2 years trying to figure this problem out. Engine swaps, ignition swaps, TFI swaps, adding MSD components, stock Ford stuff, aftermarket stuff, wiring harness', EVERYTHING. IM telling you. Its the DAMN computer.

Tell ya what. If you swap it out and it DOESN'T fix the problem, I will send you the money for the computer myself VIA Paypal.

There is a 100% guarantee...

"edit"

Make sure you get the right Processor for your car.

haywood11 · February 24th, 2009, 07:18 AM

WoW. +1 on that

p.s. (i still think im right) hehe

February 21st, 2009, 07:32 PM	#1
astras Newbie Join Date: Jan 2009 Location: Tampa, FL Posts: 35 iTrader: 0 reviews	No start when hot... any ideas? OK, so the car will start up great when it is cold. Idles fine, revs good. If I let it sit running for a while, and shut it off it won't restart again. Stock 302 w/ E303 Things I have tried/checked: - Replaced the ECT - Replaced the TFI module - Have spark - Timing is good - Fuel pump makes the "hum" when you turn the ignition on Only thing, is when I turn the motor over when it is hot and I press the release on the Schrader valve not much fuel comes out. I am going to get a pressure gauge tomorrow to check it out. The other thing, when I put the engine back together I had gotten a little bit of gasket sealer on the ground strap. The first few times I fired the motor, it was very sluggish and the negative battery cable started to smoke. I don't know what I might have fried (if anything) but it doesn't make sense that it fires right up like there is no problem if it's cold. Any suggestions?

February 21st, 2009, 07:47 PM	#2
89LX347 Hardcore Enthusiast Join Date: Apr 2007 Posts: 1,304 iTrader: 0 reviews	does it turn over when its hot? could be your starter. go back, if you havnt already, and make a good ground connection. __________________ I believe in art when it is not seen. I believe in music when it is not audible. I believe in God when He is silent.

February 21st, 2009, 09:58 PM	#5
93mustank Banned Join Date: Aug 2008 Location: Phoenix,AZ Posts: 3,014 iTrader: 1 reviews	TFI's dont like the heat....................... __________________ PeteAndersonRacing.com

February 21st, 2009, 11:27 PM	#6
JohnC Enthusiast 1997 Mustang GT 13.56@102.94 Join Date: Oct 2007 Location: Murfreesboro and Old Hickory, TN Posts: 888 iTrader: 1 reviews	Check the TPS, IAC, EGR, and coolant temp sensor? __________________ 1997 Mustang GT Aluminum Block PI swap & 4R70W to TR3550 swapped. Best 1/8: 2.04 60ft 8.74@81.85 & Best 1/4: 2.045 60ft 13.56@102.94 all on stock 245-17's My Garage

February 22nd, 2009, 12:00 AM	#8
NeverEnuff Hardcore Enthusiast 1989 LX Coupe 7.1@99mph Join Date: Jan 2009 Location: Texas Posts: 1,685 iTrader: 0 reviews	OK. Here we go. I am 3 for 3. Get a new computer or new tune. Your warm start side of the tune is bad. I am willing to bet ANYONE WHATEVER that your computer is at fault. Get a new computer and it WILL fix your problem....period. Edit: I have been through this...and THIS...and ONLY this is the reason why I am into modulars... Last edited by NeverEnuff; February 22nd, 2009 at 12:12 AM.

February 21st, 2009, 07:48 PM	#3
astras Newbie Join Date: Jan 2009 Location: Tampa, FL Posts: 35 iTrader: 0 reviews	It turns over fine... doesn't even attempt to fire though. Starter is good.

February 21st, 2009, 09:36 PM	#4
Nice 5.0 Regular 1993 12.9 @ 105 Join Date: Jan 2007 Location: Raleigh NC Posts: 299 iTrader: 0 reviews	If your getting spark the problem is on the fuel side. Check fuel pressure. If fuel pressure is good you need to see if you have injector pulse. Basically use a test light and probe the wires at the injector connection. Crank the motor over and the test light so pulse at a rapid rate. Make sure you check this when the car won't start. If you dont have a pulse then it's time to troubleshoot. That's where the fun begins. Luckily not much stuff to check on the fuel injection side. It could be a bad injector, sensor or computer. I've seen a bad TPS sensor cause the same problem. That should get you started.

February 22nd, 2009, 08:36 PM	#9
NeverEnuff Hardcore Enthusiast 1989 LX Coupe 7.1@99mph Join Date: Jan 2009 Location: Texas Posts: 1,685 iTrader: 0 reviews	Any luck?

February 22nd, 2009, 08:40 PM	#10
mustanginky MM Fanatic 2000 gt Join Date: Feb 2009 Location: La grange, KY Posts: 4,254 iTrader: 2 reviews	i've had this issue before on my old 5.0 and my timing was off. but you say yours is good so... __________________ Procharged 2000 5 Speed BAB GT, built motor, blower cams, speedy dyno tune 412 hp, 450 rw tq HARDCORE CREW BRIGHT ATLANTIC BLUE CREW #1 MEMBER

February 23rd, 2009, 09:21 AM	#11
astras Newbie Join Date: Jan 2009 Location: Tampa, FL Posts: 35 iTrader: 0 reviews	Well, no luck yet. The funny thing is, you have ONE CHANCE to start the car. If you shut it off and try to restart it, it attempts to start. If you miss that chance, it won't start again until I do one of two things: - Either wait til it's cold or - Plug in my code scanner. All I have to do is plug it in. Don't even have to turn it on. The car will fire right up. No 'effing clue. This is driving me nuts.

February 23rd, 2009, 09:34 AM	#13
superbean Hardcore Enthusiast 1998 Cobra 13.24@105.66 Join Date: Aug 2008 Location: North Carolina Posts: 1,778 iTrader: 0 reviews	high resistance, heat, burnt ecu trace possibly. __________________ weeee foooord!

February 23rd, 2009, 10:43 AM	#14
haywood11 Regular 1988 mustang lx interior torn out! Join Date: Jul 2007 Location: jacksonville,NC Posts: 273 iTrader: 0 reviews	if it shuts off when its hot and fires up when its cold i would check the ignition control module......... __________________ 88 5.0 with bbk shorties, bassani x-pipe w/o cats, custom 2.5in w/flowmasters. t-5 conversion, gt40p heads cobra upper and lower. stock SD. Plans: full black interior, black paint and supercharger??? Last edited by haywood11; February 23rd, 2009 at 10:49 AM.

February 23rd, 2009, 10:46 AM	#15
grnstang Hardcore Enthusiast 91 LX 13.7@101 Join Date: Oct 2008 Location: Norwalk OH Posts: 1,426 iTrader: 1 reviews	is it possible the starter is at fault? heat soaked? __________________

February 23rd, 2009, 06:58 PM	#16
haywood11 Regular 1988 mustang lx interior torn out! Join Date: Jul 2007 Location: jacksonville,NC Posts: 273 iTrader: 0 reviews	any takers on what i said? __________________ 88 5.0 with bbk shorties, bassani x-pipe w/o cats, custom 2.5in w/flowmasters. t-5 conversion, gt40p heads cobra upper and lower. stock SD. Plans: full black interior, black paint and supercharger???

February 23rd, 2009, 08:14 PM	#17
grnstang Hardcore Enthusiast 91 LX 13.7@101 Join Date: Oct 2008 Location: Norwalk OH Posts: 1,426 iTrader: 1 reviews	actually yes that could be what it is too. i didnt read your post before. __________________

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February 24th, 2009, 07:18 AM	#20
haywood11 Regular 1988 mustang lx interior torn out! Join Date: Jul 2007 Location: jacksonville,NC Posts: 273 iTrader: 0 reviews	WoW. +1 on that p.s. (i still think im right) hehe __________________ 88 5.0 with bbk shorties, bassani x-pipe w/o cats, custom 2.5in w/flowmasters. t-5 conversion, gt40p heads cobra upper and lower. stock SD. Plans: full black interior, black paint and supercharger???

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