Search found 3 matches

by jamlip
Fri Sep 19, 2008 4:53 pm
Forum: Wiring and Sensors
Topic: MAP vacuum hose problem
Replies: 2
Views: 354

Re: MAP vacuum hose problem

It's a 36 year old 911 - maybe that has something to do with it! 60-ish is the best I could get with any tuning.

Thanks for your help - much appreciated.
by jamlip
Fri Sep 19, 2008 4:17 pm
Forum: Wiring and Sensors
Topic: MAP vacuum hose problem
Replies: 2
Views: 354

Re: MAP vacuum hose problem

I have spent so long thinking about this and you just explained it in two sentences - thanks!

Still don't understand why my engine only produces a vacuum of 64kPa at idle though... If I shortened the hose, would I see a lower reading (in the same way it is easier to suck through a short straw as ...
by jamlip
Fri Sep 19, 2008 2:36 pm
Forum: Wiring and Sensors
Topic: MAP vacuum hose problem
Replies: 2
Views: 354

MAP vacuum hose problem

I have about 7 feet of rubber vacuum hose connecting my intake to the MAP potentiometer on my ECU. At idle, my car gives about 64kPa, which seems high.

If I connect a 3ml syringe to the vacuum line as per the test in the MS manual, I can get 84kPa of vacuum. If I connect the same syringe to a 6 ...