HELP!!! Surging idle

[nogard]

I have a 1992 4Runner 4 cyl. 5 speed. I can't pin point when the problem occurs. It will happen with it is warm and cold. The problem is most evedant at idle with the brake pedal pushed in.

The engine surges from 1500 rpm to 800 rpm. If I take my foot off the brake it will high idle at 1200 rpm smoothly, most of the time.

Then sometimes when I let off the gas and push in the clutch as the idel drops it will surge once and the way down to idle. Also while it is in "surging idle mode" the truck stumbles on acceleration, almost like it is missing.

I'm pretty sure this is a vaccum problem. I've sprayed carb cleaner on all the vaccum hoses trying to find a leak, but no luck. Could someone please point me in the right direction? Any feedback would help, thanks.

 

[Schmutz]

The engine surges from 1500 rpm to 800 rpm.

Hi, I'm a new member. Did you ever get this fixed? My son has a 1st Gen with the 3.0 V6 and the same thing would happen. Once we were sitting at an intersection behind a cop, in neutral, and the stupid thing would just surge like you said between idle - 1500 RPM. It was embarrassing. Thankfully he ignored us. Anyway, I don't see any responses to your inquiry. but if you learned something in fixing it, please share. thanks

 

[AuSeeker]

Hi, I'm a new member. Did you ever get this fixed? My son has a 1st Gen with the 3.0 V6 and the same thing would happen. Once we were sitting at an intersection behind a cop, in neutral, and the stupid thing would just surge like you said between idle - 1500 RPM. It was embarrassing. Thankfully he ignored us. Anyway, I don't see any responses to your inquiry. but if you learned something in fixing it, please share. thanks

You do realize this was posted over 21 years ago and that member hasn't been on the forum in over 19 years?

 

[Schmutz]

You do realize this was posted over 21 years ago and that member hasn't been on the forum in over 19 years?

That's funny. I'm a new member just trying to do some research and take advantage of the resources here. I'll try to watch that moving forward.

Do you have any tips how I can find out if a member is still active before I try to engage them?

 

[AuSeeker]

That's funny. I'm a new member just trying to do some research and take advantage of the resources here. I'll try to watch that moving forward.

Do you have any tips how I can find out if a member is still active before I try to engage them?

Click on their user's name and visit their profile page and you can see when they were last active on the forum.