70barracuda Posted Thursday at 04:19 PM Share Posted Thursday at 04:19 PM Having issues with an 86 2.5 TBI. The thing will start perfect when cold but once I drive it and it gets hot, its a total pain to start. Have to crank and crank and feather the gas pedal to get it to start. Once it starts its perfectly fine. I have replaced, CPS - no change Ignition box, coil, cap and rotor - no change CTS - no change AIT - no change Fuel pump - no change Rebuilt the tbi unit with new regulator and injector Cleaned up all engine grounds and added new ones - no change. Its driving me nuts. The truck runs awesome and starts great when cold. Its just the hot starts that are a pain. Link to comment Share on other sites More sharing options...
Eagle_SX4 Posted Thursday at 04:32 PM Share Posted Thursday at 04:32 PM My experience has been that is usually a vapor lock issue. Maybe try insulating the fuel line. DEI has some stuff that is great. I was able to get some at my local auto parts store. https://www.designengineering.com/heat-sheath-aluminized-sleeving-0-5-x-36/ Link to comment Share on other sites More sharing options...
70barracuda Posted Thursday at 04:48 PM Author Share Posted Thursday at 04:48 PM 15 minutes ago, Eagle_SX4 said: My experience has been that is usually a vapor lock issue. Maybe try insulating the fuel line. DEI has some stuff that is great. I was able to get some at my local auto parts store. https://www.designengineering.com/heat-sheath-aluminized-sleeving-0-5-x-36/ Thats what I also have been thinking. I have stuff to make brand new fuel lines and ill be wrapping it in that. Link to comment Share on other sites More sharing options...
eaglescout526 Posted Thursday at 07:26 PM Share Posted Thursday at 07:26 PM Huh. Interesting. Can’t say I’ve run into that issue where at least the CPS doesn’t solve such an issue. I’m wondering if the ISA isn’t operating properly. Link to comment Share on other sites More sharing options...
watchamakalit Posted Thursday at 09:06 PM Share Posted Thursday at 09:06 PM Have we learned nothing from recent events? Sorry for the outburst there, have your checked ignition timing? Link to comment Share on other sites More sharing options...
70barracuda Posted Friday at 12:33 AM Author Share Posted Friday at 12:33 AM When I turn it off the isa moves the throttle back to open so I believe its functioning. It'll only start if I feather the gas and itll slowly come to life. If I don't do anything itll just crank and crank. Link to comment Share on other sites More sharing options...
eaglescout526 Posted Friday at 12:41 AM Share Posted Friday at 12:41 AM Huh. How interesting. Ok it’s resetting. Do we know if it has been adjusted at some point in its life? I’m almost wonder if it’s working but it’s not “working” like yeah it moves and makes sound but is it opening to the correct position for next start up kind of working. Just a thought. Does it have a full cluster? Link to comment Share on other sites More sharing options...
70barracuda Posted Friday at 01:30 AM Author Share Posted Friday at 01:30 AM 48 minutes ago, eaglescout526 said: Huh. How interesting. Ok it’s resetting. Do we know if it has been adjusted at some point in its life? I’m almost wonder if it’s working but it’s not “working” like yeah it moves and makes sound but is it opening to the correct position for next start up kind of working. Just a thought. Does it have a full cluster? That part i do not know. Is there a writeup for it? Yes full cluster Link to comment Share on other sites More sharing options...
70barracuda Posted Friday at 01:37 AM Author Share Posted Friday at 01:37 AM Found your write up on it. Ill definitely be doing this tomorrow. Link to comment Share on other sites More sharing options...
eaglescout526 Posted Friday at 02:07 AM Share Posted Friday at 02:07 AM Sweet glad ya found it! As far as the full cluster, one little thing I’ve noticed with the tach is it bounces when cranking. That’s how I’ve been able to determine if it’s something in ignition. If that bounces, you should be good in terms of the ignition system. Like I’ve had a couple CPS issues and when the tach doesnt move, I unplug and plug it back in and it’ll fire right up. Link to comment Share on other sites More sharing options...
70barracuda Posted Friday at 02:21 AM Author Share Posted Friday at 02:21 AM 12 minutes ago, eaglescout526 said: Sweet glad ya found it! As far as the full cluster, one little thing I’ve noticed with the tach is it bounces when cranking. That’s how I’ve been able to determine if it’s something in ignition. If that bounces, you should be good in terms of the ignition system. Like I’ve had a couple CPS issues and when the tach doesnt move, I unplug and plug it back in and it’ll fire right up. Huh interesting but good to know. Ill add it to the list of stuff to check tomorrow. I also just got the REM hooked up today and was playing around with it so I'm sure that'll give me some good info once I figure out the menus Link to comment Share on other sites More sharing options...
eaglescout526 Posted Friday at 02:24 AM Share Posted Friday at 02:24 AM REM should provide some insight as well. Link to comment Share on other sites More sharing options...
70barracuda Posted Friday at 11:39 PM Author Share Posted Friday at 11:39 PM ISA was dead on doing eagle's procedure Link to comment Share on other sites More sharing options...
eaglescout526 Posted Friday at 11:46 PM Share Posted Friday at 11:46 PM Holy crap! That’s a first. Usually that’s messed with by other when they have an idle issue. Link to comment Share on other sites More sharing options...
hgeranium Posted yesterday at 01:42 AM Share Posted yesterday at 01:42 AM What the heck is an ISA? Link to comment Share on other sites More sharing options...
eaglescout526 Posted yesterday at 01:46 AM Share Posted yesterday at 01:46 AM 2 minutes ago, hgeranium said: What the heck is an ISA? Idle Speed Actuator. It’s similar to the IAC but it’s only found on TBIs. You can find it on the GM cars and trucks and our own 2.5L. Link to comment Share on other sites More sharing options...
hgeranium Posted yesterday at 02:12 AM Share Posted yesterday at 02:12 AM 25 minutes ago, eaglescout526 said: Idle Speed Actuator. It’s similar to the IAC but it’s only found on TBIs. You can find it on the GM cars and trucks and our own 2.5L. Good looks! I'll add that to my infinitely increasing internal inventory of acronyms Link to comment Share on other sites More sharing options...
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