Hey guys so I failed the E test for the 3rd time
Hoping you guys can give me some more ideas.
Here is what I did just before the test:
Changed the spark plugs to new NGK "6" (had 5's)
Adjusted timing back to 6 degrees (was at 12)
Changed fuel filter (did this on both of the Miata's)
Changed the O2 sensor (new bosch unit)
Reinstalled my original PCV as I think the new one may have been bad (the new one let more air pass both ways than the old one)
Just changed the oil and filter
Here are the readings on my 3rd attempt
at 40 kmh
hc ppm 78 limit reading 88
co % 0.44 limit reading 0.24
no pm 907 limit reading 595
2281rpms at 40kmh
hc ppm 200 limit reading 198
co % 1 limit reading 0.46
I really wanted to tell the guy to drop it a gear to get the revs up, was 2281 too low for the 1.6?
The shop owner was telling me to look into the PCV or Mass air flow??
One thing that i did not mention to you guys yet is that i checked the compression the other day and noticed that the compression was low on #3
I had 175 on 1 2 4 but 3 was at 115-120psi
I really didnt even want to think about it but I would assume this could be a big factor in the high unburnt fuel readings?
The car runs and idles well, also there is good power on tap...
I did a wet test and it looks like the bottom end is alright.
I did a quick leak down test but need to spend some more time pinpointing the exact issue.(hopefully this weekend)
I truly doubt the problem would be due to abuse as I bought the car from a 75 year old guy who followed maintanence to a tee and the car was a bit of a garage queen. Probably would have been better if he did run the crap out of it....
Can I start by trying to remove any carbon build up?
What is the best way? Water?
Any other tests or sensors to check?
I think the next step may be to remove the head and have it rebuilt...this is really screwing up my turbo install plans..
I really want to sort this out so i can move on...
Any more tips or thoughts are appreciated