Red Rider

My car is at the dealer, but they're gonna have Shad from Comptech take a look. The problem is that my car has been surging on cold startup. I literally didn't have to hit the gas to move, then until completely warm it wanted to stall at any stop. I had it in 5,000 miles ago for the same problem and Comptech diagnosed it and replaced the FPR. Well, the dealer said they got the exact same error code, so back to Comptech. I hope they get it right this time, i'll keep you guys posted.
Oh yeah, i was running rich and my gas mileage improved by 2mpg, but my power was down

Any comments Scalbert, SC dudes ??

allmotor_2000

Possibly it lowers fuel pressure significantly during idle. Do you have a Fuel Pressure Guage? If its FPR related, its one of the reasons one should not run 80+ psi fuel pressure consistently on these systems; they are bound to fail.

Other issues could be:

(1) TPS sensor moved?
(2) MAP Sensor blocked somehow
(3) Clogged injectors?

What is the code (DTC, if any) thrown... you said Honda sees a DTC.

Red Rider

Not sure what the code was, they'll tell me tomorrow.

NSX-Tuner

Bummer... sorry to hear that you're having problems with the S/C. At least you should be able to get it fixed before the meet. Also, are the ECU/ESM connections soldered? If this hasn't already been done, you might want this done at the same time.

Red Rider

I mentioned this thread to the Tech at the dealer, he's going to discuss it with Shad as soon as he gets a hold of him. They can keep the car for as long as necessary, i just want them to get it right this time.

NSX-Tuner

Just as long as they get it back to you before 6/12

Red Rider

Yeah, otherwise i better start modding the TSX loaner they gave me !! That would be funny trying to keep up with you guys in that

Allout

If not, we'll be chasing an MDX through the hills.

Red Rider, I see what you mean about the great relationship you have with your dealer and the way they work with Comptech. It's always a concern that it gets into a finger pointing session - Acura problem or Comptech problem. Good luck on a speedy resolution.

SCTL-SS

Sorry to hear about your car problem. I don't know if this is the same as what you are describing or not but during the cold start up the engine does race some. The RPMs go to about 2000 on startup and I have noticed from time to time the RPMs dip at idle or upon deceleration. This is very rare though. Even though you gained some MPG the loss in power does sound concerning.
I hope your troubles get resolved.

scalbert

Knowing the code will certainly help. I can think of several other items (IAC, TPS or even a sticking SC bypass valve) it could also be. But knowing the code will help poitn us in the right direction.

Chemmech

IS your s/c belt tight, and have you soldered your ESM connection? My engine would surge when it was cold, but since I did the above it's really smooth.

Smitty

Glen did you notice this:

Sitting at a stop, the RPM's would jump around as if the ECU was searching for something?

make sure those connections on the ESM are SOLDERED, 3 of us had this problem, those connectors they supply do not bite enough.

Seattle Cl-S

...Sorry Red Rider, but you're not going to scare me out of getting Satin Slayer's SC next weekend. You're just gonna have to face it that you'll be having some F/I competition at the Portland meet.


BTW, what is this ESM that needs to be soldered? Is it the E-manage?

scalbert

It is the device which comes with the kit that the MAP signal before the ECU. It's purpose is to limit the MAP voltage so that the ECU never sees the boost.

Red Rider

Thanks to everyone for your ideas, i'm trying to get the code info from the dealer and also to find out if Comptech is working on it.

Red Rider

No, this surge is strong, as i said you don't even need to hit the gas and the car would buck forward.

Red Rider

The belt has been tightened or checked at every service, it does squeak with the AC on but they told me the belt is as tight as they can go

I definitely mentioned the soldering of the ESM.

Red Rider

Hey, no problem, this is minor compared to the fun i've been having !!!!!!!!!!!!!

Hopefully, Comptech will get it fixed and maybe this will help anyone with a similar problem in the future.

I'll see you in PDX

Red Rider

Just got off the phone with Niello Acura and here's the code :

P0172 - " Fuel Metering Rich "

Shad is gonna try and get to it by tomorrow, i'll keep you posted.

Smitty

So they are going to swap out your FPR then?.... or your fuel pressure needs adjusted?

Red Rider

He replaced the FPR last time. Shad is picking it up from the dealer this afternoon so i'll have Comptech lookin it over. I'm sure he'll get to the bottom of it this time.

scalbert

So, your fuel trim values went to beyond -18% or so. If it is the FPR then it is not pulling the fuel pressure down with vacuum. The first thing I would check is the fuel pressure, IMO.

NSX-Tuner

My last visit to CompTech to fix a problem with my S/C was very interesting. Both Ryan and Shad worked on my car. It was like watching brain surgeons operating on someone's brain. They were amazing to watch - competence, precision, quality and speed was their mode of operation.

Red Rider

That's what i'm looking for !!

typeR

sound like IAC maybe

Red Rider

You guys are awesome, i wish i knew as much. Can't wait to get it back and let you know what the diagnosis was.

allmotor_2000

Guess its running rich at idle. Scalbert is correct - after a certain percentage of correction (18%-20%) the ECU throws a code. This is only during non-WOT conditions, I believe. Having a fuel pressure guage would have helped with this problem. If the fuel pressure is at 65'ish PSI during idle (vacuum on), then it will definateley throw that code... I've had it before when I tried the Vortech FPR a long time back!

Red Rider

What's the solution for Comptech

darrinb

when my car was acting up with the revs shuttering it was the tps, but it just wasnt on cold start ups...

Chemmech

I think the surge might be due to your b-pipe and exhaust, I can arange to have oem parts sent to you for a swap . J/K I hope that your car gets fixed soon .

allmotor_2000

I think the problem occurs when you run high fuel pressure through the FPR for long periods of time. This is why no production FI car runs a rising-rate regulator.

Bluto

Clean your air filter recently? My car has had surging problems twice, after cleaning and oiling the filter. I figured I put too much oil on and some traveled down the intake, onto a sensor.

Red Rider

Quick update. I talked to Brian at Comptech today and he did mention that he soldered the ESM, and he thinks it's running fine now. He's gonna keep it for a few days to check the cold startup. He said that when they ran the tests that they couldn't find a problem with the FPR.

And no, i'm not swappin with you

Chopsie

Thats what I was thinking, Scalbert told me once before that it could have been the problem I was having when coming to a stop (engine wanted to die), but I never had the surging.

NSX-Tuner

Hmmm... could another have got bitten by the ECU/ESM bad connection problem??? I hope it's that simple...

Smitty

Can not STRESS enough to you guys that those connectors they send attached to the ESM are garbage.. my car runs like a damn dream now that I soldered the ESM into the ECU wires..


Glad the problem was fixed Glen, just keep us posted..

Chemmech

Woo Hooo! But, no swap?

Red Rider

Thanks Bro, i hope you're right !! Can't wait to get it back, unfortunately that won't be til Friday because i'm out of town this week. That does give them plenty of time to keep checking so when i do get it back it's really fixed this time !!

Red Rider

I was tempted

Chaptorial

Cool deal Glen, glad to see everything came out A-OK.