Car has a misfire at high rpm (5000+) and threw 2 codes
07-16-2010, 10:49 AM
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Car has a misfire at high rpm (5000+) and threw 2 codes My z 28 seems to misfire at high rpms when im driving spiritedly, usually in 3rd or 4th gear. since the gears are longer than 1st and 2nd, i noticed it more
The engine light started blinking and then it threw these codes
P1380 EBTCM DTC Detected Rough Road Data Unusable and a P0300 Random/multiple cyl misfire
It was doing this for about a week
I changed my 02 sensors, ( i had to anyway) theyre brand new, wires arent burnt, plugs are still good
is it possible that i mightve broken a valvespring or something? Im thinking about pulling the valve covers off this week to look
What would cause these? any ideas fellas? thanks in advance
The engine light started blinking and then it threw these codes
P1380 EBTCM DTC Detected Rough Road Data Unusable and a P0300 Random/multiple cyl misfire
It was doing this for about a week
I changed my 02 sensors, ( i had to anyway) theyre brand new, wires arent burnt, plugs are still good
is it possible that i mightve broken a valvespring or something? Im thinking about pulling the valve covers off this week to look
What would cause these? any ideas fellas? thanks in advance
07-16-2010, 10:53 AM
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Could be a valve spring or bent pushrod... could be the tune... could be plugs/wires... could be a lot of things. Start with the easy stuff - pull the plugs - they generally tell a story...
07-16-2010, 11:27 AM
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had the same issue after my cam swap .. changed the plugs still getting the same codes ..
then i cleaned the mas air .. changed the wires .. and it completely gone ...
so you better start with the easy stuff as mentioned ^^^
then i cleaned the mas air .. changed the wires .. and it completely gone ...
so you better start with the easy stuff as mentioned ^^^
07-17-2010, 12:49 PM
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Thanks fellas. My tune is spot on. I'll check the easy stuff first like mentioned above. my wires are definately good. it probably wouldnt hurt to change the plugs (theyre TR5's with 25,000miles on them) I'll let ya know what it was once the problem is solved. Im still kinda leaning toward the bad valvespring/pushrod bc i ran the **** out of it lol. Ill check the easy stuff first tho
