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Discussion Starter #1
Recently my civic started having a really bad misfire. It would shut off whenever i gave it gas. Out of no where it started running fine again but now whenever im about to hit vtec in 1st & 2nd it’ll buck a little then go into vtec pretty fine. Not at its full power tho. On the highway downshifting to 4th & giving it a pull it wont even let me go into vtec. It starts misfiring at 5200rpm(whenever vtec hits). The car right now is idling well. No misfires on idle but highway pulls are a no. Could it be a bad vtec solanoid or injectors/sparkplugs? Anything would help.
 

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How many miles do you have on your spark plugs? Sounds like a spark issue for sure. I'd also try disconnecting each coil pack separately while idling. The cylinder that doesn't stumble when you unplug it will be your bad coil. I also had the same problem when my MAF was really dirty. I bought some MAF cleaner then it was fine.

Start with the easiest one first. Which would be coil packs.
 

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Recently my civic started having a really bad misfire. It would shut off whenever i gave it gas. Out of no where it started running fine again but now whenever im about to hit vtec in 1st & 2nd it’ll buck a little then go into vtec pretty fine. Not at its full power tho. On the highway downshifting to 4th & giving it a pull it wont even let me go into vtec. It starts misfiring at 5200rpm(whenever vtec hits). The car right now is idling well. No misfires on idle but highway pulls are a no. Could it be a bad vtec solanoid or injectors/sparkplugs? Anything would help.
Also make sure your VTEC solenoid is doing its job too. Maybe it's not sensing the oil pressure correctly at all times.
 

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Discussion Starter #4
Also make sure your VTEC solenoid is doing its job too. Maybe it's not sensing the oil pressure correctly at all times.
Okay will do, thank you!
How many miles do you have on your spark plugs? Sounds like a spark issue for sure. I'd also try disconnecting each coil pack separately while idling. The cylinder that doesn't stumble when you unplug it will be your bad coil. I also had the same problem when my MAF was really dirty. I bought some MAF cleaner then it was fine.

Start with the easiest one first. Which would be coil packs.
Not long probably like 1500 on new plugs. But ima clean the maf & see if it makes a difference. Thank you
 
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