Looks like I may have bad ICV...

[Warren N.CA]

electrical checks indicate that the input signal to the ICV is correct, then that will be the next step.

Have you tried removing the idle control valve and cleaning it? Some WD40 and a toothbrush might do a lot to help fix or at least alleviate the problem.

While you're at it, triple-check the vacuum hoses, fittings, and clamps.

This helped my car a LOT.

[ryan roopnarine]

it seems like you're under the impression that simply removing/installing this item will impart radical ramifications onto the operation of your vehicle....that's why i suggested you swap, as if it doesn't work, you just swap back and drive the e34 to the e30 store. the only way its likely to damage something working is if by removing the hose you crack the end from the stresses. my icv hoses/unit has been on/off with no changes in vehicle operation so long as one does not try to start the car. it is prudent, if you feel that way, to leave the 535 alone until you've tried all the other steps, i guess. i have hose clamps on the end of mine for extra sealing, but it doesn't come that way. pull on/off, spray some o2 safe cleaner, rinse, repeat until it isn't gucky any more, and try. removing this component isn't as drastic as, say doing something like removing an intake manifold, IE you don't have to worry about surface sealing affecting operation in that drastic a manner.

body has no clamps on either end. Do I just pull them off, and then push them back? Is any adhesive sealer used?

[JonE]

I would also advocate a good cleaning with throttle body cleaner, take ICV out and soak it good. also take the large hose off and clean the throttle body. This cleaning cured my poor cold starting situation with my '89 325ic. Good luck.

[Warren N.CA]

least one car for transportation. Whenever an inexperienced technician tears into a car, unanticipated bad things can occur. No way I will even cast a covetous glance in the direction of the 535's ICV, unless and until the other car is running, and then it won't be needed. That's because I KNOW what I don't know.

it seems like you're under the impression that simply removing/installing this item will impart radical ramifications onto the operation of your vehicle....that's why i suggested you swap, as if it doesn't work, you just swap back and drive the e34 to the e30 store. the only way its likely to damage something working is if by removing the hose you crack the end from the stresses. my icv hoses/unit has been on/off with no changes in vehicle operation so long as one does not try to start the car. it is prudent, if you feel that way, to leave the 535 alone until you've tried all the other steps, i guess. i have hose clamps on the end of mine for extra sealing, but it doesn't come that way. pull on/off, spray some o2 safe cleaner, rinse, repeat until it isn't gucky any more, and try. removing this component isn't as drastic as, say doing something like removing an intake manifold, IE you don't have to worry about surface sealing affecting operation in that drastic a manner.

[ryan roopnarine]

i was acquiescing with you in that (post)....it just seemed like you were worried about removing the icv from the 325....ie, no special provisions are needed wrt hose sealing for disconnecting the hoses from the e30 to clean it. if it was a t-shaped icv like mine, was gonna suggest that you reverse the hoses and see if it made a difference. the l-shaped one doesn't provide for that option though.

least one car for transportation. Whenever an inexperienced technician tears into a car, unanticipated bad things can occur. No way I will even cast a covetous glance in the direction of the 535's ICV, unless and until the other car is running, and then it won't be needed. That's because I KNOW what I don't know.

[Warren N.CA]

electrical checks first. If they reveal no problems with the electrical input to the ICV, then I'll remove it, clean, inspect, test, and replace, if needed. I'm kinda busy now, so it may be a few days before I have time. (When you work for yourself, you discover that you a have a more demanding boss than ever before, insisting that you work overtime for free, etc.)

i was acquiescing with you in that (post)....it just seemed like you were worried about removing the icv from the 325....ie, no special provisions are needed wrt hose sealing for disconnecting the hoses from the e30 to clean it. if it was a t-shaped icv like mine, was gonna suggest that you reverse the hoses and see if it made a difference. the l-shaped one doesn't provide for that option though.

[Warren N.CA]

I would also advocate a good cleaning with throttle body cleaner, take ICV out and soak it good. also take the large hose off and clean the throttle body. This cleaning cured my poor cold starting situation with my '89 325ic. Good luck.