My son just bought an 87GT from a guy that said this site is where to go. I’m sure my son will be creating an account and you’ll hear from him as well. I got the car and it’s got a problem with a hesitation/bog down upon hitting the gas. When it’s cold it will usually come close to stalling or stall. When it’s hot it hesitates for a second and picks back up more so.
Any ideas on where I should start to look this weekend? I did look and see how to get a code and I got a 12, 24 and 32? I noticed that the EGR vacuum solenoid fresh air hose from the air filter was blocked off with a screw in it??? So I hooked it back up to the steel line on the fire wall then to the air filter. That didn’t help any. I also see that you can check the EGR by plugging up the vac hose from the EGR vacuum solenoid to see if that does anything. I read it on line somewhere and not sure if that is an accurate enough way the check it if at all. After temporarily plugging up no change.
With work that is my 5 minutes each day this week to look at it. I plan on hitting it hard this weekend. I did follow all vac lines and checked/replaced if needed. The one place where I see missing a vac hose is a coil type part that is bolted on the trunk wall right above a can. It has two hose hookup on one end, one hose on the other end and a two wire plug going to it. I have no idea what it is or does but has no lines hooked up going out the two hose end. The other end has the hose going out to a part right next to it. That is where I gave up till this weekend. Any ideas on where to start would be greatly appreciated.
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08:56 AM
PFF
System Bot
donnie072003 Member
Posts: 1956 From: LaSalle, IL. Registered: Feb 2010
I am having a similar problem with mine. Currently it has been narrowed down to a vacuum leak somewhere. Am spending my weekend troubleshooting more. Read my thread it might have a little info that is valuable to you for this. Most of what I have done so far is towards the end of the thread for this problem.
Can is the cruise control. It won't cause the hesitation. We can talk about fixing that sometime.
Hesitation - plugs are the first thing to look at. Many times the front plugs haven't gotten changed for a long time. If you do change the plugs - pull the 4 13mm headed bolts on the trunk lid and remove it so you have enough room to get your arm and wrench down there.
Take the EGR valve out and clean it and make sure it moves freely. Carbon holding it open can cause your trouble.
What does the engine idle at when warm? AT or MT? If the car idles below 1000 when warm you don't have a vacuum leak. If when warm the engine in neutral idles MORE than 1000 rpm you do have a vacuum leak.
Wires, rotor and cap. Check them, replace if unknown or old.
Timing - Check the timing and make sure its at 10 btdc - With the A-B jumper in place and the SES light FLASHING:
He doesn't say it and some nuube whined but you have to loosen the distributor hold down bolt before you can move the distributor. A socket, universal and long extension will make it. Yeah it's tight down there.
Fixing your code 32 most likely isn't the cause of the hesitation trouble but its something you should do sometime. Don't make it task #1 because all you most likely will get out of it is making the SES light not come on.
Finally got a chance to try your suggestions. I still got a hesitation when i hit the gas but at least I am narrowing it down. I have to let up on it so it doesn't stall and can recover.
I did change the plugs (the old ones i took out were the high dollar ones) they looked good all were the same condition. maybe a little carbon on them but otherwise good. took the EGR valve off along with the pipe going to it and did a good cleaning again little carbon but not much. no cracks in the pipe and ERG moves freely when pressed. put back together and installed all 4 new gaskets.
It is an automatic and idles at about 1500 when cold and settles to about 1100 when warmed up. I looked at all the lines and cant seem to find any signs of a leak. I think i will get some starter fluid and spray down the the whole vacuum system piece by piece... part by part... hose by hose. I would think there would be a idle difference if i were to hit a vac leak.
Got new rotor and cap. the wires LOOK good and snug. new PVC and Fuel filter. I haven't had the chance to check the timing yet. really never messed with timing but with the wealth oh knowledge here im sure i can do it. any other suggestions for when I attack it again?
I really appreciate taking the time out to help a newbie. I have learned a ton so far.
Thanks, Dwayne
[This message has been edited by Dwayne (edited 09-16-2010).]
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05:16 PM
phonedawgz Member
Posts: 17106 From: Green Bay, WI USA Registered: Dec 2009
I had a similar problem, After many hours of searching i found that the Idle Air Control tube to the Plenum from the Throttle body was unhooked. Actually the guy I bought it from put the wrong tube on and had it just pulling fresh air. Found the tube under the front seat. Hooked it back up and runs great. The tube runs from a switch behind the Distributor at the bottom of the intake, curls around behind the EGR Tube and runs straight in to the Throttle body. Check to see if it is hooked up. Could even have a bad oring where it connects to the Throttle body. Do your Pipes get glowing hot?
