97 Corolla Insufficient EGR?

[gobraphil]

I have a 97 1.8 that is throwing an insufficient EGR flow Check Engine Light. My question is this, Can this be caused by a vacuum leak?
I pulled off the intake manifold to fix a burned starter wire and the problem surfaced soon after.
Other symptoms include:
High idle when cold outside
Trans wont shift into 4th until warmed up


Any ideas? Im thinking it is a vacuum leak but i cant find it.
Thanks in advance.

[TRCar54]

it's probably the EGR modulator valve. It's pretty easy to check. Each port should hold a vacuum. If not, the diaphragm inside has split.

[gobraphil]

Thanks for the reply. Would the vacuum leak in hte modulator cause the trans shifting problem?

[TRCar54]

You're welcome.

If you have an overdrive automatic (4 speed), the transmission should not shift into 4th (OD) until it has warmed a bit. Mine usually shifts into 4th when the temp comes about 1/4" off cold.

[gobraphil]

OK, thanks again. I just ASSuMEd it was related to the other problem i had. I will try to test the regulator this weekend. I have bookmarked the articles on here that mention the procedure to test it. It hasnt made sense yet but it will once i look at the egr setup on the car again.

[TRCar54]

Here's a link where we discussed the problem in detail.

Good luck

http://www.corolland.com/forums/inde...3&hl=modulator

Originally Posted by gobraphil

OK, thanks again. I just ASSuMEd it was related to the other problem i had. I will try to test the regulator this weekend. I have bookmarked the articles on here that mention the procedure to test it. It hasnt made sense yet but it will once i look at the egr setup on the car again.