MSPNP - starting the car feels like someone kicking the starter
12-04-2018, 02:59 AM
#1
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Join Date: May 2005
Location: Earth
Posts: 71
Total Cats: -5
MSPNP - starting the car feels like someone kicking the starter
Hey I’m running mspnp on my 2004 msm. When I start the car, it is a very harsh start. When the starter turns over, it makes a loud knock sound and takes my 4-5 turn over before the car starts.
Any idea why?
TIA!
Any idea why?
TIA!
Last edited by soospecmx5; 12-04-2018 at 04:12 PM. Reason: No replies
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12-07-2018, 12:49 PM
#3
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Join Date: May 2011
Location: Miami
Posts: 559
Total Cats: 77
For what it is worth, I had a similar amount of bucking when I had it at around 4 to 7. I increased it to 15 and it cranked better.
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12-07-2018, 01:42 PM
#4
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Join Date: Dec 2010
Posts: 1,207
Total Cats: 97
My starter would go whrrrrr, whrrrrr, whrrrrr, BANG... whrrrr, whrrrr, whrrrr, BANG a few times before she'd finally catch. I changed that value from 18 to 8 degrees and the problem disappeared.
BTW, you'll generally not get many answers here unless you post your tune and a log. Posting your tune might be helpful for this issue, and having your mods listed in your sig block is useful as well.
BTW, you'll generally not get many answers here unless you post your tune and a log. Posting your tune might be helpful for this issue, and having your mods listed in your sig block is useful as well.
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12-07-2018, 01:56 PM
#5
Cpt. Slow
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Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,215
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I’ve messed around with this as well, I believe it has something to do with what your ignition values are at 100kpa and the lowest rpm cell. But I could be wrong. I’ve gone as low as -10 to keep it from backfiring.
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12-11-2018, 09:00 PM
#6
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Thanks for the reply! My signature has been updated to see my supporting mods.
Attached is my ms file.
@curly Please take a look at my file to see if everything is ok.
Another thing is that I can not get my wideband to see what megasquirt is seeing as air/fuel ratio.
Attached is my ms file.
@curly Please take a look at my file to see if everything is ok.
Another thing is that I can not get my wideband to see what megasquirt is seeing as air/fuel ratio.
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12-11-2018, 10:45 PM
#7
Cpt. Slow
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Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,215
Total Cats: 1,140
Looks fine. You're at 8 degrees cranking advance. Try 3, if that doesn't help, try -2. If you feel like 3 is better, -2 is worse, try 1 or 0. If none of these help, try 10 or 13.
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12-14-2018, 10:59 PM
#8
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I compared my map with the base map provided.
The stock map had dwell set at 6 and my tuned map was set at 3.5, so I set it the same as the base map at 6 and advanced cranking is set at 15.
so far the crank feels a lot better, maybe 1 hard kick/buck then whirlllll then starts. No consistent kick/buck.
I also compared the cranking rpm. Base map is set at 400, my tune was at 225, I set it at 205. I played with this also as 400 still had the hard kick/buck start. At 205, it feels more smooth of a start.
Ill guess I’ll leave it at this.
Not sure if I’m doing the right thing but the start is much better.
Thanks everyone!
The stock map had dwell set at 6 and my tuned map was set at 3.5, so I set it the same as the base map at 6 and advanced cranking is set at 15.
so far the crank feels a lot better, maybe 1 hard kick/buck then whirlllll then starts. No consistent kick/buck.
I also compared the cranking rpm. Base map is set at 400, my tune was at 225, I set it at 205. I played with this also as 400 still had the hard kick/buck start. At 205, it feels more smooth of a start.
Ill guess I’ll leave it at this.
Not sure if I’m doing the right thing but the start is much better.
Thanks everyone!
Last edited by soospecmx5; 12-17-2018 at 11:55 PM.
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