Not Starting when Hot? WTF

[mk3supreme]

I don't know what to do guys. It wouldnt start after I shut it off after 8 miles of driving. I checked the EFI fuse and it blew so i changed it.It still does the same thing so I changed the EFI Main relay and it started. Then I drove for 20 minutes and cut it off and the same thing???? I tried to check my codes but it just blinks no codes no series of blinks just repeated blinks. I am stomped guys if anybody can help it would be greatly apprecieated. Thanks

 

[Nick M]

Sounds like a bare wire somewhere. Something probably rubbed through and you have a direct ground. Vibration going down the road causes it to touch the chasis. Just a possibility.

 

[GrimJack]

More details here would help.

How exactly does it not start? Does it not crank, crank slowly, not fire, what?

When you drove for 20 minutes and the same thing happened, did it just die, or did you shut it off and it refused to start again? Did you test the relay that you pulled out?

 

[Supra Blues]

More details here would help.

How exactly does it not start? Does it not crank, crank slowly, not fire, what?

When you drove for 20 minutes and the same thing happened, did it just die, or did you shut it off and it refused to start again? Did you test the relay that you pulled out?

Oops, didn't mean to do this, but since I did:

:withstupi

Sounds to me like it is cranking, but because the EFI fuse is blown, no starty.

I hate electrical gremlins. Does it start cold? If you relace the fuse and the relay and let it sit over night, start and run for 1 minute, shut down, will it then restart?

 

[mk3supreme]

Grim I tested the relay for continuity and it did not have any so I bought a new one. After few miles of driving I cut it off and try to start it and all it does is crank. It cranks but no start. I have power and spark but it seems like I am not getting any fuel?? The fuse can't be blown because I checked it and when the car sits for a couple hours it will start when its cold? I dont know guys. I think it's a bad ground connection but I cant find it any help guys would be great.

 

[mrnickleye]

You said you have spark when the problem occurs.

Drive the car around until its good and hot. Turn off and wait a couple of minutes. Try to start for a just a moment. NO start?? Take a rag (for soak-up) and a wrench under the hood. Crack open the cold start injector line. (use rag to keep fuel under control)

Have a friend try to start the car. If fuel is squirting out the fitting, then the fuel pump system is working.

No fuel, then its a fuel 'delivery' problem (fuse, relay, pump, or no signal to these).

If fuel, then you may have a problem with injectors not functioning when system is hot.:1zhelp:

 

[mk3supreme]

Guys an update. When it gets hot it wont start? so I live on a hill and I let it roll down and I dumped the clutch and it started right up??? Whats up with that? I got code 43 does that have something to do with it? I need help guys.I'm out of ideas and I thinks it's a bad ground connection. HELP

 

[shaeff]

You said you have spark when the problem occurs.

Drive the car around until its good and hot. Turn off and wait a couple of minutes. Try to start for a just a moment. NO start?? Take a rag (for soak-up) and a wrench under the hood. Crack open the cold start injector line. (use rag to keep fuel under control)

Have a friend try to start the car. If fuel is squirting out the fitting, then the fuel pump system is working.

No fuel, then its a fuel 'delivery' problem (fuse, relay, pump, or no signal to these).

If fuel, then you may have a problem with injectors not functioning when system is hot.:1zhelp:

the easiest way to figure out if the fuel pump is working correctly is to jump diagnostic terminals +B and FP and simply listen near the gas door for the fuel pump. no need to be cracking open the CSI.

-shaeff

 

[jmcboost]

OK, this happened to me a year ago and I would popstart my car for about 6 months straight unless the engine was cold. I found out that the "main" relay I bought new from auto zone was bad, so I put the old one back in and everything is fine. The machanic that helped me with it told me that the main relay was getting cherry hot after only ten minutes of running and thats when I replaced it with the old one and It works fine. The relay still gets hot but it does not lock up. This probably means I still have a grounding problem somewhere. See if this works thoug.

 

[mk3supreme]

OK guys I have a much more serious problem now. I live In LA and I drove to eagle rock and it was ok. SO I came out from the office and tried to start it, so I push started it and it ran so on the way back on the 110 freeway I noticed it was smoking. From the outside and it was getting on the inside. I popped the hood and it was smoking for the heater hose that goes from the block to the heater. Heavy smoking while I was driving it was getting worse and it started to rattle, kinda like it was coming from the engine. And it started to lose power when stepped on the pedal and it cut off so i popped the clutch and it started then it cut off again and I popped the clutch and it the tires just hooked up no start. And when I crank it it sounds horrible??? Help

 

[GrimJack]

Smoking is bad. Noises are worse. The rear end locking up when you pop the clutch is *the* worst. This means the engine is toast - usually siezed rather badly at the least.

 

[Nick M]

I checked the EFI fuse and it blew so i changed it.It still does the same thing

The fuse can't be blown because I checked it and when the car sits for a couple hours it will start when its cold?

So the fuse blows or it doesnt?

A relay can go bad and only work when cold. Circuit opening relay has happened before.

 

[mk3supreme]

Guys I guess it's a rebuild. Anyone knows which direction to go in for the 500 hp mark??

 

[IJ.]

Guys I guess it's a rebuild. Anyone knows which direction to go in for the 500 hp mark??

Think of a price and double it !
(then add 25% just in case)

 

[Allan_MA70]

Think of a price and double it !
(then add 25% just in case)

block = 25% ?

 

[IJ.]

LOL nah I'd used the 25% waaay before the block

 

[GrimJack]

Check the thread in the FAQ section on how to add power - and buy everything listed there. Then add forged pistons, new rings, bearings, and thrust washers to that list. And add new valves, an entire engine seal kit, a new water pump and a new oil pump.

Take the cost of all those parts, and add another similar cost called labor.

Then add another 25% on top of that for machine work.

Bolt all that together and buy some good tuning time on a local dyno, and you should be over 500 rwhp.

 

[csr ma71]

For me, it was the small wire on the starter, a bit of the copper was exposed. And it might not be the heat that's killing your car, it might be you driving somewhere and then knocking something loose so that when you stop and then try to start it, the loose bit doesn't cause it to start. Like say, loose battery terminal or starter cable on battery terminal.