I've FINALLY got this thing running, but not driving it just yet - but just idling for no certain amount of time, or no apparent temperature threshold - it leans out and dies.
I've adjusted ASE/WUE, squirts per cycle, just about everything fuel related I can find and the problem still persists. There doesn't seem to be any signifigant voltage spikes. All of my connections are soldered. Grounds are by the book - The wideband is grounded to the same place as the MS is. I'm sure it's something simple, but I'm just not seeing it.
It's tuned with TunerStudio, V3 Mainboard. Latest firmware- version escapes me right now.
It's a Chevy 383 using direct coil control, VR sensor (inside the distributor), 80# injectors etc.
Engine randomly leans out and dies for no apparent reason
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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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turbo-brooks
- MegaSquirt Newbie
- Posts: 20
- Joined: Tue Jan 11, 2011 7:08 pm
Engine randomly leans out and dies for no apparent reason
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Engine randomly leans out and dies for no apparent reaso
Looks like a WUE issue, as the engine leaned out about the same time as an abrupt rise in temperature. It suddenly jumped from around 95 to 165 degrees in the space of about a minute. Where's your coolant temperature sensor located? I get the feeling it's measuring things wrong.
On an unrelated issue... 38 degrees timing advance at idle doesn't seem like a good idea to me.
On an unrelated issue... 38 degrees timing advance at idle doesn't seem like a good idea to me.
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turbo-brooks
- MegaSquirt Newbie
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- Joined: Tue Jan 11, 2011 7:08 pm
Re: Engine randomly leans out and dies for no apparent reaso
It's a turbo car, and the high advance (down low) helps it spool up fast - it's not WOT tuned yet, so - obviously the lead will be pulled WAY back under boost.
The abrupt rise in temperature came from a partially filled radiator, but I figured out the real problem yesterday.
There were two problems.
One - the pot's had not been properly adjusted and it was dropping tach counts pretty regularly (can be seen in that log). The dying part, was directly related to this. Once it was adjusted with the oscilliscope, it never died again, even though it was seriously lean. (but it did misfire)
Two - the injector opening time was only set at 1.0Ms, these are fairly big injectors and they just don't snap open and closed that quick.... I upped the opening time to either 1.2 or 1.4 (can't remember- alternator is kinda weak I think). The lean spots after warmup were GONE. Now, I have to go back and retune the WUE and ASE with the increased injector opening time.
The abrupt rise in temperature came from a partially filled radiator, but I figured out the real problem yesterday.
There were two problems.
One - the pot's had not been properly adjusted and it was dropping tach counts pretty regularly (can be seen in that log). The dying part, was directly related to this. Once it was adjusted with the oscilliscope, it never died again, even though it was seriously lean. (but it did misfire)
Two - the injector opening time was only set at 1.0Ms, these are fairly big injectors and they just don't snap open and closed that quick.... I upped the opening time to either 1.2 or 1.4 (can't remember- alternator is kinda weak I think). The lean spots after warmup were GONE. Now, I have to go back and retune the WUE and ASE with the increased injector opening time.