idle problem

fc nut · 11-14-2011, 07:54 AM

what controls the cold start system?

fc nut · 11-14-2011, 08:38 AM

a friend of mine bought an 87 gxl with 231k miles. a previous owner replaced the engine with 105k on it. they also replaced the fuel lines and some of the vaccum lines. he replaced the bac and airflow meter. someone tried to fix the issue, they tried to adjust the idle,but couldn't get it right. they sold the car to a guy i know. i looked at it and all the vac lines are in their correct spots, i reset the tps,i even retarded and advanced the timing a bit and still nothing. i got the idle down to 1200 rpm,but if you rev it it jumps to 1500 and stays there. he replaced the radiator,water puump and thermostat as well. is there a sensor that controls the cold start system?

RETed · 11-14-2011, 04:15 PM

It sounds like something is stuck in the throttle body.
Typically, the coolant passages in the coolant body (or in the hoses going in and out of it) get clogged, which prevents proper flow of (hot) coolant to the thermowax that allows the idle to "kick down" once the engine warms up.

If a previous owner f*cked with the throttle body, that'll prevent the thermowax from doing it's job too.

-Ted

fc nut · 11-15-2011, 07:00 AM

thanks for the input. i'll check it the next time i go to his house.

91convguy · 11-20-2011, 02:51 AM

My 91 Vert with about 165,000 miles just few weeks ago had to have the thermowax replaced was doing same thing. Fix the problem. Its located passenger side back throttle body close to fire wall have to remove couple vacuum lines and coolant line sets up in body faces downward has oring around is when you pull in down and out throttle body unit. There a button on bottom thermowax mine was frozen stiff couldn't get it move at all.

joemaddox · 12-14-2011, 04:05 AM

Thermal pellet is bad sounds like

11-14-2011, 07:54 AM	#1
fc nut member Join Date: Jun 2008 Location: Lebanon,Ohio Posts: 282 Rep Power: 18	idle problem what controls the cold start system? __________________ leaving my carbon footprint....one start up at a time

11-14-2011, 08:38 AM	#2
fc nut member Join Date: Jun 2008 Location: Lebanon,Ohio Posts: 282 Rep Power: 18	a friend of mine bought an 87 gxl with 231k miles. a previous owner replaced the engine with 105k on it. they also replaced the fuel lines and some of the vaccum lines. he replaced the bac and airflow meter. someone tried to fix the issue, they tried to adjust the idle,but couldn't get it right. they sold the car to a guy i know. i looked at it and all the vac lines are in their correct spots, i reset the tps,i even retarded and advanced the timing a bit and still nothing. i got the idle down to 1200 rpm,but if you rev it it jumps to 1500 and stays there. he replaced the radiator,water puump and thermostat as well. is there a sensor that controls the cold start system? __________________ leaving my carbon footprint....one start up at a time

11-15-2011, 07:00 AM	#4
fc nut member Join Date: Jun 2008 Location: Lebanon,Ohio Posts: 282 Rep Power: 18	thanks for the input. i'll check it the next time i go to his house. __________________ leaving my carbon footprint....one start up at a time

12-14-2011, 04:05 AM	#6
joemaddox Hooked For Life! Join Date: Nov 2010 Location: Philomath OR (five blocks long!) Posts: 137 Rep Power: 15	Thermal pellet is bad sounds like __________________ s5 Infini RHD -RIP S6 Efini RHD RE, Custom Burnout -Build in progress

11-20-2011, 02:51 AM	#5
91convguy The Newbie Join Date: Feb 2009 Location: Central Ohio Posts: 12 Rep Power: 0	My 91 Vert with about 165,000 miles just few weeks ago had to have the thermowax replaced was doing same thing. Fix the problem. Its located passenger side back throttle body close to fire wall have to remove couple vacuum lines and coolant line sets up in body faces downward has oring around is when you pull in down and out throttle body unit. There a button on bottom thermowax mine was frozen stiff couldn't get it move at all.