I am still having issues in drive or reverse, it will not idle correctly, and throws code 33, MAP high, but only in gear, in P or N, it was fine. According to freescan, the MAP is at .9 or so in gear, .7 out. It does not die, but idles at 500rpm, which is as you know too low for a CC306. It idles right where I set it in park and neutral. It gets no KR at all, and I ran it for about 45 minutes, logging it on freescan. I have replaced the IAC, MAP, KM, KS, TPS, PCM, and it still does this. Also, after extended driving, the #4 cylinder exhaust primary glows a little bit. It does not relly buck or kick like it is horribly misfiring(like it did when I first drove it home, no signal to Inj# 4, intermittent to 3#8). It still has a 48mm TB and stock injectors, and a ported MAF, which is getting replaced with a stock one on Sunday. Any ideas, or help would be appreciated. Thanks!

 

Pretty much all those sensors input info to calculate the injector pulse width. I say look for a bad or dirty injector after checking your pressure on the rail.

Jeff D.

 

You didnt say so I will ask has the car been tuned on?

 

Yes.

 

What units are you measuring MAP in? 0.6V = 5.9"Hg = 20kPa., 1.1V= 8.9"Hg = 30kPa. No way your 306 will be anywhere near that level at idle. not even a stocker can pull 20kPa. The 306 is going to read 50-60kPa, at least.

DTC is MAP "volts high, vacuum low" which is a code you would expect to see if you have a lack of vacuum.

Have you checked the valve adjustment, particularly on #4. Sounds like you've got a valve open.

[EDIT] Are you sure MAP isn't reading "70" to "90" kPa? That would definitely indicate a problem.

 

It's whatever unit of measurement freescan uses, I believe it is not volts, but bars. If I remember correctly, it mean 900 millibars. If it is the same kind of "bar".

I have checked the valves repeatedly, but I will check again this afternoon. When I set them, I could just barely tun the pushrod, at TDC for that cylinder. Thanks for the help...

 

"Bar" is metric system standard atmosphere = 100kPa = 14.5psia = 29.5"Hg.

Yes.... appears you are seeing 90kPa at idle, which is wayyyyy to high and will set the code. You have virtually no vacuum at idle... well about 3"Hg at idle.

 

OK, that makes sense, but is there a reason it would only be a problem in gear? In P and N, I am at about 600-700 millibars. Only in gear am I higher.