IS it possible the indexed cylinder to the CAM Angle sensor is 180 degrees out of phase? I've seen that happen several times, could make the car real difficult to keep running.

And your right, The BISS and SAS are referred to interchangably since there isn't a set screw on the throttle stop.

Another possibility is the MAF sensor is misreading, or there's a major leak somewhere (Maybe the DV is partially open at idle) but not revving over 3000rpm is usually a dead giveaway that the MAF sensor isn't reading correctly (assuming everything else is working fine)

 

How would the indexed cylinder to that cam angle sensor get 180 out? Maf was never unplugged or even touched, and all vaccuum lines and connectors seem fine.

 

Mitsu says it's the MAS, so whoever said that, thanks for the great troubleshooting! Good job. It was plugged in, it just went bad.

 

Ok, mitsu returned my car, said it was the fuel pump!

 

Glad to hear they found the problem. So it runs now? How do you like the cams?

 

now, ive heard to set the pin in the DSM hole on the fidanzas. DAMN IT, why can't there be a universal way to do things?

 

LOL. You already have the ability to index it properly with the TDC marks, but move it over to the DSM index and guess where TDC is yourself...there's a helpful suggestion.

It could technically be indexed in a large number of positions around the gear so long as the cams themselves are at their correct TDC positions with #1 cyl at TDC. Trouble with that is, YOU would need to determine the gear position that equates to the TDC position of the cams. I suppose you could do that, but using the factory TDC timing tics and an already correctly indexed gear sure seems a lot easier

DSMs and Evos have the same size cam gears/# of teeth, but the TDC timing marks are in different locations and that's the only difference between using the two indexes. Why make finding TDC a guesstimate when doesn't need to be?

 

well, i think it it has been covered by andrew at dyno4mance. he tells me in the DSM hole, TDC is 1 tooth to the right of the 0 mark on the adjustment scale. IDK, i need to have a long talk with some people about these things. What would be the advantage of using the DSM hole anyway? And the gears came with no instructions what so ever....i don't even know where TDC is using the EVO hole. man i need help, LOL

 

There would be no advantage to using the DSM hole since the Fidanzas are also indexed for the Evo. Just get that out of your mind altogether or it will just confuse you more. IF you are you using a 4G63 cam gear that is only indexed for the DSM (ie. Unorthodox, older Fidanzas, etc.), the timing marks will not line up correctly on the Evo. In that case, yes the Evo TDC mark will be indicated about 1 tooth off when truly at TDC.

OK, for starters, any pulley run with the timing belt will have a TDC mark on it. There will also be a mark on the engine that each pulley mark should line up with when #1 cylinder is at TDC. Keep in mind there are "2" TDCs in an engine stroke, one for compression and one for exhaust. If the cam gears are on their marks, but the crank pulley mark is nowhere to be found, rotate the crank 360°, line them up again and the crank pulley tic should be somewhere in the 3°-0° range on the timing chart (molded into the timing belt cover on top of the crank pulley).

The TDC inidicators for the cam gears on the Evo are on the edge of the valve cover under the cam gear cover...they are basically two little "slits". On the stock cam gears you will see marks painted white at the edge of the gear and that are in line with the dowel pin hole (index)...those are the TDC tics. When the engine is at TDC, the marks on the gears will line up to the slits on the valve cover (and the crank pulley tic should be on/near TDC on the chart). On adjustable cams, the TDC "mark" is either the 0° line on the adjustment scale OR a separate tic, like on the Fidanzas.

If you've never done a timing belt/cams before, I would very highly recommend begging/pleading/paying someone who has done them on a 4G63 to do it for/with you and learn from that experience. I am most certainly not knocking you because everyone has to learn it for the first time, but if you're unsure how to even find TDC marks and stuff, you really shouldn't be doing cams/gears by yourself. You *really* don't want to be learning from mistakes when it comes to mechanical timing!

 

Thank you for that, but, i know where all the TDC marks are on the car, stock cams and everything....but, how am i supposed to know which one is the TDC mark on the fidanzas? there are 2 hashes OTHER than the 0 mark on the scale. Im sure it will be a lot easier to tell when im actually looking at it, but im just trying to get all the info strait before i pull anything apart. Im not just gonna slap somethin together and hope it works, im just new to cam gears right now.....as i was new to everything else i did before i actually did it.

Again, do you know which mark is the TDC mark on the fidanzas? That is really all i need to know.

 

Ah...one of the index holes on the Fidanzas has "EVO" stamped right next to it...use that one and the correct TDC tic should become glaringly obvious. I believe it is the tic to the left side of the scale...

HTH

 

you know I had the same problem with another car of mine (Nissan). We had the MAF on backwards and it would do exactly what you described. Fliped it over problem solved.

 

awesome, thanks.

 

maybe someone can help me with mine. I have a Power FC and my idle is very high on startup but then it calms down after the car warms up. The problem is, once we installed the cams, the idle fluctuates. It constantly revs up and drops off from about 1500 to 500 or so. it just goes up and down. it will do this for a few seconds and then level off around 800 or so. The car drives great and we're getting about 345awhp. I just can't stop at a red light without having to keep a little throttle to it without it fluctuating. Any ideas?

 

sounds like an idle bypass gone haywire...hmmm.

more info needed...
are you flashed for cams??
fuel pump??
plug wires in correct orientation??
ex cam sensor correct orientation??
hmmmm??? do you have an OBDII tool or a pocketlogger??