Idle and overheating

For discussing MicroSquirt (TM) configuration and tuning of fuel parameters (including idle valves, etc.).
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RobC
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Idle and overheating

Post by RobC »

running MS1 on zetec

Engine is idling ok with a borrowed map but my idle rpm is 2400rpm... which to me seems very high... How can I get this down? PW is about 4 and crank degree is 17 with high-impedance injectors

:? getting confused by the whole thing...

Reading the megamanual again... would this be to do with crank pulse widths which were set at 10 :? possibly?

cheers for any help...
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mops
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Post by mops »

just lower your ve bins around idle point and/or reduce the amount or air getting to engine at idle....
BMW, 1985, E30, 325i, 2-door, 5spd , 127k miles, short shift, MSII, V3/code 2.684/60-2 wheel/MT 2.25, LC-1 wbO2, ignitor module mod driving msd coil/, 3 pin Bosch PWC IAC mod
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Mike_Robert

Post by Mike_Robert »

If it's idling at 2400 it's using the VE bins corresponding to that rpm and whatever MAP it's running at. Reducing VE numbers won't fix this problem. A properly adjusted speed-density system will gladly and properly fuel excess air in the intake. Your idle speed of 2400 indicates you have excess air getting in somehow. There are numerous potential causes - idle screw set too high, leaky manifold/TB gasket, leaky manifold/head gasket, a crack in a manifold, a loose connection after the TB, a leaky IAC valve or even a leaky advance diaphragm in a distributor that has vac advance.
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RobC
MegaSquirt Newbie
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Joined: Tue Mar 01, 2005 11:04 am
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Post by RobC »

Many thanks... hadn't thought of that... just had a new map sent to me and it's lowered the RPM to 1700 but... you might be right about a leak... I'll check and lot you know

Cheers

rob
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