jump idling need help
#1
Look
Thread Starter
Join Date: Jan 2008
Location: Cali-modesto
Posts: 9
Likes: 0
Received 0 Likes
on
0 Posts
jump idling need help
ok well im about to buy a gtu that has a jdm motor T2 1990 about roghly 30k miles. it has an idling problem when the engine gets warm the idling goes up and dow from 1,000 to 1,500. i figure maybe a tune up will do since it may be a misfire needs new spark plugs or i should look for vaccum leaks. wat can cause this? has anyone ever gotten this. im thinking can it be the turbo? can anyone help me a bit? its ok when its in high rpm. when driving
#3
Senior Member
![](https://www.rx7club.com/images/misc/10_year_icon.png)
iTrader: (2)
Join Date: Mar 2004
Location: Charlottesville, VA
Posts: 690
Likes: 0
Received 0 Likes
on
0 Posts
Surging idle can be cured most of the time with correct TPS and idle speed adjustments. First, make sure the TPS resistance is set to 1000 Ohms, engine fully warmed up. Then go back and adjust idle speed (initial set connector shorted) to the 700-800 range. When the idle speed is adjusted too high, the system will send a fuel cut signal which drops the idle. When the idle drops too low it then raises it to the preset level but that's too high again so it sends the fuel cut signal. You end up with the up and down idle which is basically harmless, but very annoying.
#4
My car hates me
![](https://www.rx7club.com/images/misc/10_year_icon.png)
iTrader: (1)
Join Date: Nov 2005
Location: SE Wisconsin
Posts: 380
Likes: 0
Received 0 Likes
on
0 Posts
It could also be a vacuum leak. I had a bunch of problems with rotting gaskets on my old N/A engine and it made the engine surge between 1000 and 1500. Eventually took the whole Intake manifold off and replaced all the intake gaskets, Some of the vacuum tubing, and the injector O rings. Ran great after that. Its a fairly easy job to do if you have the time to do it.
Thread
Thread Starter
Forum
Replies
Last Post
LongDuck
1st Generation Specific (1979-1985)
12
10-07-15 08:12 PM