MS2 - how do i reduce my idle rpm
#21
Update,
I got the idle valve test working. I was making the stupid mistake of turning on the test first and then changing the step values. This just sent the idle to 3000 rpm.
So then I changed the values and THEN turned on the test. At the suggested low values of 15-30 the idle remained the same (1350rpm). When I changed it to 90 it jumped to 3000rpm again. I presume this shows the idle valve is working. Also, when I disconnected the plug on the valve, the revs jumps up about 1000rpm.
So, it looks to mee like its working, but just not enough.
One other thing, the idle rpm increases as the engine warms up, ie first start its 1500rpm, then drops steadily as engine warms up to operating temp. Then as the car is driven the idle gradually creeps up (driving through traffic) to 1700rpm
Going to change the injectors in next few days (550cc EV14s). I wonder will this solve it or make it worse?
Anyone any suggestions?
I got the idle valve test working. I was making the stupid mistake of turning on the test first and then changing the step values. This just sent the idle to 3000 rpm.
So then I changed the values and THEN turned on the test. At the suggested low values of 15-30 the idle remained the same (1350rpm). When I changed it to 90 it jumped to 3000rpm again. I presume this shows the idle valve is working. Also, when I disconnected the plug on the valve, the revs jumps up about 1000rpm.
So, it looks to mee like its working, but just not enough.
One other thing, the idle rpm increases as the engine warms up, ie first start its 1500rpm, then drops steadily as engine warms up to operating temp. Then as the car is driven the idle gradually creeps up (driving through traffic) to 1700rpm
Going to change the injectors in next few days (550cc EV14s). I wonder will this solve it or make it worse?
Anyone any suggestions?
#22
So then I changed the values and THEN turned on the test. At the suggested low values of 15-30 the idle remained the same (1350rpm). When I changed it to 90 it jumped to 3000rpm again. I presume this shows the idle valve is working. Also, when I disconnected the plug on the valve, the revs jumps up about 1000rpm.
Again, you've got something wrong as it isn't the megasquirt its the car.
#23
Thanks Grant,
Your reply makes sense, I have not taken the throttle body off or the IAC. I did disconnect some coolant hoses to the warm start valve on the throttle body when changing the injectors. I am getting a mechanic to change to injectors again tomorrow. Maybe if something was disturbed it might be found and put right during the injector instal. If not I'll just drive the car into a lake on boost and look for bubbles !!!
Your reply makes sense, I have not taken the throttle body off or the IAC. I did disconnect some coolant hoses to the warm start valve on the throttle body when changing the injectors. I am getting a mechanic to change to injectors again tomorrow. Maybe if something was disturbed it might be found and put right during the injector instal. If not I'll just drive the car into a lake on boost and look for bubbles !!!
#24
Junior Member
iTrader: (4)
Join Date: Oct 2009
Location: College Station, TX
Posts: 275
Total Cats: 5
Just let the car idle then spray around where you think the leak might be with some carb cleaner. It doesn't take much, just a little squirt. That's how I found my fuel injector vacuum leak. If there is a vacuum leak, spraying the area will cause a change in the idle.
#25
Ok, Finally sorted this when changing my injectors to EV14's
As Grant diagnosed there was a vacuum leak under the warm up valve. My mechanic found it while changing the injectors. The car now idles about 850rpm with the idle screw adjust out. previously it was in all the way.
Just need to retune my VE table now for new injectors and its down to the track on 30th March.
As Grant diagnosed there was a vacuum leak under the warm up valve. My mechanic found it while changing the injectors. The car now idles about 850rpm with the idle screw adjust out. previously it was in all the way.
Just need to retune my VE table now for new injectors and its down to the track on 30th March.
Thread
Thread Starter
Forum
Replies
Last Post
Zaphod
MEGAsquirt
47
10-26-2018 11:00 PM
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
JesseTheNoob
DIY Turbo Discussion
15
09-30-2015 02:44 PM