It seems that my acceleration enrichment triggers almost randomly. I can be cruising along at 2500 rpm, constant throttle, constant MAP and the acceleration enrichment will trigger causing the engine to stutter. Can't tune and engine like that!
It is at its worst at 2500 rpm, but will trigger at other rpms, to a lesser degree, both above and below 2500 rpm.
At this point I have operated the car on 100% MAP-based accel enrich and also 100% TPS-based accel enrich, but no change with either.
Could this be electrical interference?
Should I try to test the car with no accel enrich (both MAP & TPS at 0%)?
Attached is a .jpg of a MegaLogView file showing steady state operation, with the accel enrich triggering.
Engine Config: MS II, V3.0; code: 2.873; 3.3L turbo; KnockMS
Help!
Regards
Mike
Random Accel Enrichment Triggering
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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.
Re: Random Accel Enrichment Triggering
This sounds like the same problem in the Mapdot Question post in this same subforum. I don't think it is electrical noise because it would seem that it would show up in the MAP graph. So try the mapdot scale factor change in your ini or try upgrading to the latest code rev and ini.
Re: Random Accel Enrichment Triggering
G'day Grippo...
I changed to the latest code as you suggested: v2.89. And I'm using MegaTune 2.25 p3 from DIYAutoTune.
I'm still getting the same random acceleration enrichment.
See the attached MegaLogView .jpg for an example. Also note how spiky the coolant temperature is. I think I will check all my wiring...just to make sure.
The .jpg is showing some spikes in the MAP, which are translated into acceleration enrichment
Do you have any more suggestions? I'm stumped!
Regards
Mike
I changed to the latest code as you suggested: v2.89. And I'm using MegaTune 2.25 p3 from DIYAutoTune.
I'm still getting the same random acceleration enrichment.
See the attached MegaLogView .jpg for an example. Also note how spiky the coolant temperature is. I think I will check all my wiring...just to make sure.
The .jpg is showing some spikes in the MAP, which are translated into acceleration enrichment
Do you have any more suggestions? I'm stumped!
Regards
Mike
-
Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Random Accel Enrichment Triggering
You might want to try installing a fuel filter and a restrictor orifice inline with the MAP sensor and see if that smooths things out.
Re: Random Accel Enrichment Triggering
G'day Matt...
With regards to the Fuel Filter and Orifice, is the order:
Engine, Fuel Filter, Orifice & MAP Sensor
Or
Engine, Orifice, Fuel Filter & MAP Sensor
Regards
Mike
With regards to the Fuel Filter and Orifice, is the order:
Engine, Fuel Filter, Orifice & MAP Sensor
Or
Engine, Orifice, Fuel Filter & MAP Sensor
Regards
Mike
-
Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Random Accel Enrichment Triggering
is generally the preferred order.brownms wrote:Engine, Fuel Filter, Orifice & MAP Sensor
Re: Random Accel Enrichment Triggering
G'day Matt...
Forgot to ask yesterday:
Any particular volume for the Fuel Filter?
Any particular size for the Orifice?
Regards
Mike
Forgot to ask yesterday:
Any particular volume for the Fuel Filter?
Any particular size for the Orifice?
Regards
Mike
Re: Random Accel Enrichment Triggering
Hello...
I added a 'fuel filter' to the MAP line which smoothed out the MAP signal, did not add the orifice. The trace I get from datalogging is smooth.
But, after the last run in my car I was getting no acceleration enrichment at all! The opposite problem to previous! See .jpg for logged data. Also, my AFR got very spikey (see 2nd .jpg) and then eventually smoothed out back to normal. This getting a little crazy!.
Also attached is my .msq file. I'm thinking I have screwed up a number somewhere.
I have no idea where to go now. Any hints?
Regards
Mike
I added a 'fuel filter' to the MAP line which smoothed out the MAP signal, did not add the orifice. The trace I get from datalogging is smooth.
But, after the last run in my car I was getting no acceleration enrichment at all! The opposite problem to previous! See .jpg for logged data. Also, my AFR got very spikey (see 2nd .jpg) and then eventually smoothed out back to normal. This getting a little crazy!.
Also attached is my .msq file. I'm thinking I have screwed up a number somewhere.
I have no idea where to go now. Any hints?
Regards
Mike