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engine stumbles

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Old Aug 1, 2007, 08:59 PM
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Bad little piggy?

Ok i have a 03 lancer es....rrm piggy 2.5'' exhaust (tad too big i know) rrm highflow cat, rrm headers, injen cai, my engine has a slight stumble on low rpms around idle it kinda stumbles a bit as if missing. The exhaust also pops when i get off the throttle around 3k rpm, a few pops and thats it. ive noticed this for a while and i have no idea what it might be...i ran nitrous a few times (nitrous bad i know) it is the zex wet system. I did compression test and i got 1.180 2.165 3.167 4.165 ...i have no idea if this is good or not. and i just changed plugs and oil and it still stumbles a bit. any ideas?

Last edited by forgsix3wannab; Aug 2, 2007 at 07:37 PM.
Old Aug 1, 2007, 09:09 PM
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Have you tried resetting the ECU? It could be the piggyback just adjusting to your conditions.
Old Aug 1, 2007, 09:25 PM
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yeah ive reset it many times...same problem
Old Aug 1, 2007, 09:27 PM
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oh and i forgot to mention im getting that mas code again
would that be the issue? I see no power loss at all...pulls like a champ 3k rpm + no driveability issues at all....since ive installed piggy it does that
Old Aug 1, 2007, 09:27 PM
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Have you tried removing the piggyback completely? It could be the plugs so check those, make sure they're gapped right.
Old Aug 1, 2007, 09:29 PM
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ive just changed them....whats the gap supposed to be?
i think its the mas but i dont want to spend 300$ and that not be it.nope havent removed piggy at all
Old Aug 1, 2007, 09:30 PM
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It could be the MAF, have you been spraying the nitrous before the MAF or after it?
Old Aug 1, 2007, 09:31 PM
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after about 6-8 in before TB
Old Aug 1, 2007, 09:35 PM
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If you're getting a MAF code it could easily be the MAF, maybe it got damaged by the nitrous. I would remove the piggyback first and see if that solves it. No point in spending 300$ replacing the MAF if it's not the MAF.
Old Aug 1, 2007, 09:36 PM
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i really dont want to buy a maf...the headers also glow red hot when driven hard.ill leave off piggy to see.
Old Aug 1, 2007, 09:38 PM
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That's not good, if they're getting that hot something is seriously wrong.
Old Aug 1, 2007, 09:39 PM
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exactly my point i really dont know at this point....what would make them glow?
Old Aug 1, 2007, 09:42 PM
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The engine is running very hot which generally means it's running too lean (since gasoline acts as a fuel and a coolant in an engine).
Old Aug 1, 2007, 09:52 PM
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thanks..ill check on it tomorrow..with piggy first...it runs very hot so hot the hood prop can burn you
Old Aug 1, 2007, 10:01 PM
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That's not good, my old lancer never ran that hot even in the peak of summer, hell my subi doesn't get that hot.


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