I have a MS-II V3.0 running fuel and ignition. It has been running fine, but today has displayed a problem. At idle, the RPM pulses from about 900 up to about 1700 over a second or so, then it drops back and repeats. Up until now, the idle would pulse a bit around 1000 RPM, but not this pronounced. Above idle the car runs great with good throttle response and plenty of power.
The problem started just after I relocated the 10 micron fuel filter from the drive shaft tunnel ( where the drive shaft hit it) to the engine bay. Aside from that, there were no changes. I don't see how this could be related, but there is a lot I don't understand.
Any suggestions as to where to look would be greatly appreciated. I've attached a log file and the msq file I'm running.
Thanks in advance.
Bill
Engine Pulsing at Idle
Forum rules
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
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The full forum rules are here: Forum Rules, be sure to read them all regularly.
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Tailwind
- MegaSquirt Newbie
- Posts: 30
- Joined: Sun Aug 07, 2011 8:10 am
- Location: Central Illinois, USA
Engine Pulsing at Idle
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Triumph Spitfire powered Locost
Central Illinois, USA
MS-II v3
EDIS
Central Illinois, USA
MS-II v3
EDIS
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Engine Pulsing at Idle
These tips may help:
http://www.DIYAutoTune.com/tech_article ... uning.html
It looks like it's leaning out when the RPM comes up and makes the RPM drop again.
http://www.DIYAutoTune.com/tech_article ... uning.html
It looks like it's leaning out when the RPM comes up and makes the RPM drop again.
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Tailwind
- MegaSquirt Newbie
- Posts: 30
- Joined: Sun Aug 07, 2011 8:10 am
- Location: Central Illinois, USA
Re: Engine Pulsing at Idle
Thanks for the help, Matt. Sorry to take so long to respond, but life intruded on my fun stuff for a couple of days.
I've tried your suggestions and the idle is much steadier now, at about 1200 rpm. I'd like it to be a bit lower, in the 800-1000 range, so I need to play with it some more.
Thanks, again
Bill
I've tried your suggestions and the idle is much steadier now, at about 1200 rpm. I'd like it to be a bit lower, in the 800-1000 range, so I need to play with it some more.
Thanks, again
Bill
Triumph Spitfire powered Locost
Central Illinois, USA
MS-II v3
EDIS
Central Illinois, USA
MS-II v3
EDIS