strange bucking issue
I have some weird shit going on for the last couple weeks. My logs all look good, with no sign of anything fucked up but the tach drops down like its cracked out, and its driving me crazy. At roughly 2700-3500rpm at <75kpa it happens, and twice today the same thing between 5000-5500 at 100kpa. What else should I look at? AFRs are solid all the way through every cell according to my datalogs.
http://i30.tinypic.com/30lndea.jpg http://i26.tinypic.com/2ugjwgj.jpg http://i31.tinypic.com/2rdhmz9.jpg thanks for the help. oh, I have a 9093pnp running no maf. |
Maybe the 8-9* change in timing between 100 and 128kp?
Down low i have no idea....the only time i ever got bucking with my old ms'ed escort was either when it was too lean/advanced or when i had the accel enrichment dicked up. |
Where is the MAP line plumbed in? It could be interference.
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Originally Posted by richard_ha
(Post 227279)
Where is the MAP line plumbed in? It could be interference.
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i have a feeling your issue is not MS related...
you may want to check your cars grounds, im not sure if the 1.6 cars are at the same location as 1.8 cars, but mine are kind of under the TB and one kind of under the heater hoses, check those and make sure they are kosher if your grounds check out good, check your plugs and plug wires, your problem almost sounds like a slight missfire... good luck, i really hope you get it all sorted before your track day ps-fwiw, your maps look good, a change in 1 degree in timing will not cause these types of issues ( i would hope) |
Originally Posted by whaaamx5
(Post 227282)
i have a feeling your issue is not MS related...
you may want to check your cars grounds, im not sure if the 1.6 cars are at the same location as 1.8 cars, but mine are kind of under the TB and one kind of under the heater hoses, check those and make sure they are kosher if your grounds check out good, check your plugs and plug wires, your problem almost sounds like a slight missfire... good luck, i really hope you get it all sorted before your track day |
change the mapdot threshold to 255 to rule out accel enrichments.
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well, its not the enrichments. What's next?
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http://i29.tinypic.com/154d95k.png
Looking at this part of the fuel map i see a couple things you could fix. If your idle is a little uneasy you should make all of the idle cells the same value instead of jumping around 33 35 37 35. It will idle better if they're all the same when you are using larger injectors. Do a little hand smoothing as well to make these numbers closer. I don't really care what youre afrs but with that much jump in VE I can understand why there is a stumble around 2700. I could be completely wrong but make those numbers within 2 VE of each other. Worth a try. |
thanks, I'll try this tomorrow.
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Hustler, feels like bigass misfires? My car did the same thing. Tach would swing all over the place (sometimes down to 0) and the car would fall on its face. You need spark plug wires.
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Originally Posted by Savington
(Post 227436)
Hustler, feels like bigass misfires? My car did the same thing. Tach would swing all over the place (sometimes down to 0) and the car would fall on its face. You need spark plug wires.
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