306stang

1. My 89 gt has an issue where on decel I feel like i'm hitting small bumps when i'm clearly not. I had the ujoints replaced which fixed the problem somewhat, but i still feel it.

2. It also has a bit of a surging idle in gear with my foot on and off the brake. In the surge i can feel the engine grumble just ONCE and the revs drop for a split second and it does this every few seconds. (take into consideration it's been rebuilt, but nothing fancy internally). In park it seems to rev up to 1500 rpm then climb back down and start surging again. Most the time it wont reach the 750-900 range. Sometimes, it doesnt even surge that bad. But it did it again today and i'm fed up!!!

For problem 1 i'm probably expecting either a broken rear or loose tranny mounts? correct me if i'm wrong.

for the latter i'm completely clueless, besides for something i saw someone post about a TP connection going bad.

Please help!

mjr46

I'd look for a vaccum leak possibly

Curlytop

also check your ilde air control valve... i had the same exact problem with mine about a year ago.

306stang

To find a vacuum leak i would need to pull codes which i can't do without sending it in.
So would you reccommend me sending it in to get that diagnosed?

306stang

How do i check the idle control valve?

cholericfc

take it off

306stang

I'll go rip off the IAC and clean it out.

The motor was rebuilt but all the other parts on it have about 150k miles on em so i'm sure i'll need a new one



Any help with the bump on decel?

306stang

UPDATE: I started it up and it only surges when its hot. If that helps.

306stang

Heres a video of it idling after 10 min. Once the check engine light stays on it will smell rich.
If i'm out driving it the light will come off and it drives just fine, but once its idling all the problems start up again.

http://s22.photobucket.com/albums/b3...t=DSCN2947.flv
Can i get the IAC ordered at the ford dealer?

306stang

Could this possibly be an issue. I haven't quite figured out where this goes to...It was like this when i bought the car.