Trouble staying at idle after engine gets Hot. PLEASE HELP !!!!!!!
Thread Starter
Heel & Toe
Joined: Feb 2008
Posts: 20
Likes: 0
Trouble staying at idle after engine gets Hot. PLEASE HELP !!!!!!!
I have been having trouble with my vehicle running bad or stallling after engine gets hot. I can start it cold and it will run great and pull hard. After running it for a while getting it real hot, i can park it. When I try and restart it, i Have to put the gas pedal down to keep it running or it will die out. The engine has a ZZ-4 Cam with 1.6 Harlem Roller Rockers. I pulled all the emissions off including welding the exhaust manifold ports. I have blocks offs for the EGR Valve and the cold start. I have changed everything in the distributor coil,ingnition module,pick-up,etc...
I changed all sensors, and both relays for the Mass Air Flow power up and burn off relays. The timinig was set by a mechanic shop. After the timing was set it ran awesome and pulled harder, but after it gets really hot and i try and restart it if it's at idle it will die. Kind of like it has a vapor lock. I replaced the fuel filter and cleaned out all fuel lines. I have new fuel injectors from FIC . The only thing i didn't change is the fuel regulator. Me and a friend did a vaccum check on the fuel regulator and if checked o.k. If you have any suggestions to help me out, i would sure appreciate them. This is driving me crazy. It has a Hypertech chip also. Thanks.
I changed all sensors, and both relays for the Mass Air Flow power up and burn off relays. The timinig was set by a mechanic shop. After the timing was set it ran awesome and pulled harder, but after it gets really hot and i try and restart it if it's at idle it will die. Kind of like it has a vapor lock. I replaced the fuel filter and cleaned out all fuel lines. I have new fuel injectors from FIC . The only thing i didn't change is the fuel regulator. Me and a friend did a vaccum check on the fuel regulator and if checked o.k. If you have any suggestions to help me out, i would sure appreciate them. This is driving me crazy. It has a Hypertech chip also. Thanks.
Drifting
Joined: Sep 2003
Posts: 1,363
Likes: 7
From: 1994 LT1 Coupe 6-speed with FX3 & 2000 LS1 Vert 6-Speed with F45 Hunterdon County, NJ
what year and mileage?
do you know what the mechanic set the timing at?
how long after the restart must you feather the gas pedal?
what is the digital coolant temp when its "real hot"?
do you still have o2s and if so, ar they 'heated o2's'? Also were they replaced recently?
do you know what the mechanic set the timing at?
how long after the restart must you feather the gas pedal?
what is the digital coolant temp when its "real hot"?
do you still have o2s and if so, ar they 'heated o2's'? Also were they replaced recently?
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 414
From: WV
One thing you can check is the IAC, the pintle could be sticking once the engine is hot.( if its heavily gummed up they can do this) I don't see anywhere in your post about checking this and its one of the main components that effects idle..Good Luck...WW
Last edited by WW7; Aug 14, 2009 at 02:28 PM.
Team Owner
Joined: Jul 2004
Posts: 28,499
Likes: 3,298
From: Hartford WI
Or maybe the IAC is good but simply out of adjustment?
