LEO T

You were right on the money with the modulator !

Now Im trying to figure out which tranny this is for modulator.Parts guy says they dont list c-6 past 1980 just the aod4,but her shifter just shows 1,2,drive isnt that a 3 speed ?

Know the cleanup of tranny fluid going into intake?I know tranny fluid is a good engine cleaner but I dont think this is good for the air intake.My jeep is the only fuel injected vehicle I have experience with and I have used injector cleaner poured directly into throttle body with good results,although it is easily accessible.I'm thinking if I take that same vacuum port with a clean hose and siphon directly from cleaner bottle into intake system I might get a good cleaning that way.Taking the intake off as you know is a major project alone.Oxygen sensor is probably in order also?

Oh yeh, Mom would like to give you a big hug for helping us out with this.She is not made of money and a mechaics bill would really strain her retirement budget.I'm still trying to get her to trade it in on something easier to work on for me.

 

Hi 30/06

Tell Mom thanks for the hug. I'm not sure which tranny is in that year van. I have the drive 2 1 in mine too. The OD is activated by a button on the end of the gear shift. When I lock it out of od by pushing the button a little lite goes on. Push the button to activate od, and the lite goes off. So you may have od and not realise it. If you don't have the button on the gear shift, it's probably a C-6. If it has the vacuum line running to the tranny, It probably hooks in beyond the throttle body on the manifold, you could spray some tb cleaner if you wanted to, can't hurt. The fuel rail and injectors are part of the lower intake and probably ok. These is a tag on the drivers door, or door jam that has a code # for tranny, diff, etc. Find the code and look it up in your manual. It will tell what tranny code means. Also there might be a tag or stamp on the tranny case. If you found the modulator bad, you could take it out and use the part # on that. I had this prob on a 85 with the C6 and 4.9. I have a 96 now, and I don't know for sure it has a vacuum modulator. If it's bad, I'm pretty sure they're cheap and easy to change. Getting late..gotta go and let me know how you do. Luck

 

Replaced modulator tonight,it was only $14.No more smoke.Now on to the bad idle and hesitation plus a stall on deceleration.I'm thinking Egr system but having a hard time finding EGR valve.I think it is located above and behind alternator ? I'll try using search for similar problems.Also found a bad exhaust leak passenger side donut flange,maybe its related with all these sensors on these vehicles.

 

The trans fluid coming into the intake could have fouled all kinds of stuff: IAC, ACT, injectors, FPR, PCV, spark plugs... Any one of those could cause poor idle. The Haynes manual tells how to check them all.

 

30/06
Glad you found the smoking prob anyway. Steve83 knows what he's talking about better than me. Looks like you'll be spending some time in the manual. It would be a good idea to go over the emission and driveability chapters. Very informative in regards to codes, testing sensors, and component location.
I did alot of work on my 85 myself,so I knew alot about it. The 96 has the obdII, different animal, plus 5.8 with OD tranny. I haven't had many problems with the sensors yet, so I'm feeling my way around this one too. Read over those chapters, you'll learn alot. I'm gonna bone up on them myself.

 

Thanks again,I checked plugs suprisingly they are in good shape clean as a whistle,new pcv also.IAC will not be easy on this thing.Funny thing about it is she ran through smog test for registration renewal and passed with flying colors 2 months ago.I found out today that it has been smoking on and off for about 6 months now,she thought it was the oil pan leak making it do it.It's driveable again so I guess I have alot of reading to do now, maybe see if it is throwing any codes out.


I'll be back !