won't idle when hot

'89GTStang · 04-07-2003, 08:35 PM

I just replaced my stock intake with a tfs intake and cannot get it to idle when it warms up. Before the intake it would struggle to idle when it was cold and idle fine after about 1 min. Now it idle's OK when it is cold (about like it did before) and as soon as the temp guage starts to move it will start to surge and stall. I am going to try to get a propane torch the next few days to check for vacume leaks but does anyone else have any other sugestions?

BLUEGHOST · 04-07-2003, 10:39 PM

I also have a Trickflow Intake and had the same promblem...it' turn out it was a dirty EGR valve, ........did you run a code scan

'89GTStang · 04-10-2003, 05:48 PM

Sorry for the slow response back. I only get a chance every few days to get on. I haven't tried to check the codes b/c most of the emissions stuff is gone and the codes show up already. I haven't gotten a chance to work on it much but hope to try the torch tonight.

jruppert · 04-10-2003, 07:16 PM

I would suspect that your EGR isnt working properly. If you have removed a lot of your emissions controlled parts, your computer may be trying to compensate. This isnt gonna help your driveability any.

'89GTStang · 04-10-2003, 08:13 PM

I haven't exactly removed any of them but the whole emissions system has basically fallen apart. The pipes that go from the back of the heads to some valves and the smog pump (not very up on some of the emissions stuff) have rusted our and of the valves has the end broken off and when I replaced the heads the pipe was blocked solid with carbon and junk. I don't see trying to spend a lot of money replacing parts that aren't going to do much anyways without cats. I tried to use the torch but I could not get a steady enough idle for it to help any plus I know it can be hard to tell any much difference in a fuel injected motor b/c the computer compensates for the additional fuel. I will check the codes again to see exactly what it says but they prolly won't show anything new.

04-07-2003, 08:35 PM	#1
'89GTStang Registered Member Join Date: Apr 1999 Location: greenwood, ar Posts: 118	won't idle when hot I just replaced my stock intake with a tfs intake and cannot get it to idle when it warms up. Before the intake it would struggle to idle when it was cold and idle fine after about 1 min. Now it idle's OK when it is cold (about like it did before) and as soon as the temp guage starts to move it will start to surge and stall. I am going to try to get a propane torch the next few days to check for vacume leaks but does anyone else have any other sugestions? __________________ '89 GT K&N, Twisted Wedge heads, TFS intake,FMS 1.7 rockers, Trick Flow stage 1 cam(221/225 .530in\.542in) , 3.73's, headers, off road H-pipe, Flowmasters, FMS Clutch, Tremec, PRO-5.0, FMS driveshaft, fluidyne alum. radiator, and more to come.

04-10-2003, 05:48 PM	#3
'89GTStang Registered Member Join Date: Apr 1999 Location: greenwood, ar Posts: 118	Sorry for the slow response back. I only get a chance every few days to get on. I haven't tried to check the codes b/c most of the emissions stuff is gone and the codes show up already. I haven't gotten a chance to work on it much but hope to try the torch tonight. __________________ '89 GT K&N, Twisted Wedge heads, TFS intake,FMS 1.7 rockers, Trick Flow stage 1 cam(221/225 .530in\.542in) , 3.73's, headers, off road H-pipe, Flowmasters, FMS Clutch, Tremec, PRO-5.0, FMS driveshaft, fluidyne alum. radiator, and more to come.

04-10-2003, 07:16 PM	#4
jruppert Registered Member Join Date: Jul 2001 Location: Reed City Mi Posts: 106	I would suspect that your EGR isnt working properly. If you have removed a lot of your emissions controlled parts, your computer may be trying to compensate. This isnt gonna help your driveability any. __________________ '94 GT, 347 stroker, AFR 185's, Trick Flow stage 2 Cam, Edelbrock upper and lower, 70mm Tbody, 77mm MAF, 24lb injectors, 255 lph pump, underdrive pulleys, 1 5/8 Motorsport Headers, king cobra clutch, tremec tko, 3.73 gears, flowmasters

04-10-2003, 08:13 PM	#5
'89GTStang Registered Member Join Date: Apr 1999 Location: greenwood, ar Posts: 118	I haven't exactly removed any of them but the whole emissions system has basically fallen apart. The pipes that go from the back of the heads to some valves and the smog pump (not very up on some of the emissions stuff) have rusted our and of the valves has the end broken off and when I replaced the heads the pipe was blocked solid with carbon and junk. I don't see trying to spend a lot of money replacing parts that aren't going to do much anyways without cats. I tried to use the torch but I could not get a steady enough idle for it to help any plus I know it can be hard to tell any much difference in a fuel injected motor b/c the computer compensates for the additional fuel. I will check the codes again to see exactly what it says but they prolly won't show anything new. __________________ '89 GT K&N, Twisted Wedge heads, TFS intake,FMS 1.7 rockers, Trick Flow stage 1 cam(221/225 .530in\.542in) , 3.73's, headers, off road H-pipe, Flowmasters, FMS Clutch, Tremec, PRO-5.0, FMS driveshaft, fluidyne alum. radiator, and more to come.

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04-07-2003, 10:39 PM	#2
BLUEGHOST Registered Member Join Date: Apr 2003 Location: Michigan Posts: 1	I also have a Trickflow Intake and had the same promblem...it' turn out it was a dirty EGR valve, ........did you run a code scan