notstock93

Well, I put these in my 93 LS, and got a check engine light after messing a little with the idle screw. The code is a map sensor? Its either MAP or MAF, i dont know which one he said. Anyway, part throttle drivability has gone to ****, gas mileage is down and the brakes are harder to press to stop the car. I know this has something to do with vacuum pressure with the cams, but i dont know how to fix it. My S-AFC is set to 0. Code is "3" and the car wont stay idle untill the CEL comes on. This is confusing

b19coupe

Get Hondata or other standalone. Big cams are going to drop your manifold vacuum alot, and the ECU is simply not able to compensate. I don't know if a VAFC will be able to do the trick, but perhaps you could get to a tuner who is familiar with one and he might be able to make the car run decently. The low vacuum can also fool the ECU into thinking that there is a problem with the MAP sensor, because the ECU's vacuum parameters are based on stock cam profiles.


Modified by b19coupe at 1:59 PM 6/18/2003

doughboy247

when i had my 405's in i set my fuel pressure to about 45 and leaned out my fuel to -20 to have a nice "lumpy" idle. try re-setting your ecu and run this set-up. you'll get it to idle but i'm not sure about the map sensor code??? do you have all your vacuum's hooked up right? i know the old school tegs run a map on the firewall...try checking the plug on the map as well as seeing if you're getting voltage to it.

notstock93

as far as I know I have all the lines hooked up correctly. I WILL get a hondata, but for now I need this stupid CEL out of here so I can get to and from work. Yes, I have 404's in my daily driver.

notstock93

anyone? Im looking for first hadn experiance with 404's and a MAP code....but any info would be VERY helpful.

Rocket

Your idle vacuum is probably really low and this will cause the ecu to think that your MAP sensor is out of range for the TPS reading it is seeing.

notstock93

thats the general concensus, but how do I CHANGE it. I need to know how to make everything OK.

doughboy247

what's you idle at? if it's too low, lean out your fuel with the afc at idle.

notstock93

my idle is around 950-1100. Depends on how hot/cold the engine is. I have an appointmen on saturday to get the S-AFC tuned, but they tell me there isnt a way to fix the MAP sensor problem...I say thats a bunch of bull. I wish I knew how to fix this vacuum issue...Maybe a vacuum canister?

LSiTurbo

You dont need a vac. can. reset the ecu if it still comes back theres something else wrong. I had 405a's in my car as a daily driver. Heres what i did. I drilled a little hole in the butterfly in the t-body because the idle screw did nothing on my car , set my fuel at 52psi, set my AFC at -50 @ 1k and 2k then went up from there. I drove my car 35,000+miles with that set up with no probs. You'll figure it out just keep tring.

ITRfaithful

keep us updated on the situation.

notstock93

I will. Ill have a huge review of the 404's on about 3 different sites, so be patient with me. Also, my pressure reading on the AFC isnt changing with throttle, like it usually does. Maybe I have a cracked hose causing the MAP sensor code? I think someone on here ran 405's and didnt get a MAP sensor code, so I dont think its the cams (to be honest)

The Rob

Thats not the cams. Something definitely has to be broken elsewhere. Keep us updated.

notstock93

Yea, im getting to be pretty positve its not the cams....but im having a hard time pinpointing any vacuum leaks. Im THIS CLOSE to just replacing all my hoses.

On a side note...with these cams, my car is still as fast as it was before the cams even with this vacuum CEL and whatnot....woot!

Rocket

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by notstock93 &raquo;</TD></TR><TR><TD CLASS="quote">thats the general concensus, but how do I CHANGE it. I need to know how to make everything OK. </TD></TR></TABLE>

If low vacuum is the case, tuning it out with a hondata or a stand alone system works well.

Allmotornonvtec

If the map psi on the AFC doesn't go up or down it might be the AFC, because i had a prob. with an AFC before. I unhooked it and the car ran good again with no CEL.

KS-R

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Allmotornonvtec &raquo;</TD></TR><TR><TD CLASS="quote">If the map psi on the AFC doesn't go up or down it might be the AFC, because i had a prob. with an AFC before. I unhooked it and the car ran good again with no CEL.</TD></TR></TABLE>

I've had this problem before as well.

notstock93

well, the AFC wasnt just recently installed, its ben in the car for a few months. It was untouched during he install of the cams, so the wires should have been perfect still. Plus, the other readings show accuratly.

Still have the MAP sensor code, still getting power loss and bad mileage.

LSiTurbo

That happen to Mine also the same way. Everything else worked but the map did not move. The AFC was BAD. put in a new one it went away.

notstock93

well, the car needed some tuning, and after about 2 hrs of s-afc tuning, the check engine light went away, and it idles rough. The car has dead spots in the power band and sputters slightly, but gas mileage is average for these cams and the problems arent anywhere near as bad as they were before the tuning. Im trying to set up a dyno tune, not just a blind afc tune, do you think that would help getting the flat/stuttering spots out of my powerband?

LSiTurbo

Some tuning on the dyno should be a good thing if you have a goog tuner.

xxplosif1

Weird. I've got 404's in my b20. My mechanic intalled them and we started the car and the idle was almost stock! We played a little bit with the idle screw, we bumped the fuel pressure and the idle sits there @ 750-850....I didn't get any codes or anything.

Cam gears are @ 0 intake and 0 exhaust. I'm only using a stock ecu with a chip.....no s-afc.

Good luck