Ok so I got the dreaded p300-304 codes and have done it all (I think) the cel blinks when at low rpm like idle but if I rev it to 1500 or higher it is just solid so I assumed it was gas and drained the gas as the car sat for a few months and put all new gas also check the sock on the pump not perfectly clean but pretty close. I also changed the spark plugs twice and the coils as I have okada ones so I tossed the factory ones in still got the codes across all 4 cylinders checked for vac leaks but didn't see any plus I have good vacume on my gauge 20 at idle. So any other thoughts as what it may be ? I have also put two different sets of injectors in stock and rc 650's I have but both are used so I don't know the history of them I think I am gunna send them back to rc to get cleaned and flow tested Monday if not soloved by then

 

Oh ya did a compression got 160 185 190 190 so replaced the head gasket but still got same numbers any idea on that? It's a brand new stroker motor from a shop with a high reputation

 

that's really low compression. do a leakdown test to find out where the leakage is...

 

Ya I am looking up how to unless someone has a link

 

Billmans version of the map whack cured my CEL 300/301/302/303/304 woes

With the car running tap the MAP sensor with a screwdriver handle, not too hard (in his words, no harder than if you were tapping your face), about 15-20 times, while revving the motor between idle and ~3500 (something like that).

I had been throwing those codes about every other day over the course of about a month. I tried the method above not expecting it to make a difference, but lo and behold it cleared it up.

Might work for ya, and if not, yer not out anything but a couple of minutes of your time.

 

I think I'd take it back to said reputable builder and see just how important their reputation is to them! I don't worry much about "low" numbers that are even across the board, but a 160 vs 185/190 looks suspicious...

 

Ya I am not worried about that they are low but that cyl 1 is off and I am gunna try the map whack but I just drove the car for 20 mins and unpluged the emanage and the stock computer had no misfire codes so I am guessing my last tune ( a week ago) was way off it was a new shop so I don't know the quality of t I know they used the greddy basemap if that say much on his skills and I had to show him the paramiter settings

 

Have you replaced the spark plugs?

 

wait did you say you unplugged ur emanage and the misfire went away?

 

Well it did for a 20 min drive but came back and plugs have been replaced twice