Project 3400 Roller Cam Block (Page 16/82)
lou_dias MAY 13, 01:52 PM
Once the car warms up it seems to drive almost as badly as before. I'm thinking when it's cold it's getting plenty of air...and when hot, not enough. Time to develop a cold air box instead of the contraption I have now with the air filter suspended over the cross-over pipe... Any ideas, Andrew? Let's remove the stock air filter canister on Saturday. That will give us more room to work with.

Still no code 33 so I take some comfort (and pride in my JB Weld skills) in that. As it warms up I get the code 15.
lou_dias MAY 13, 04:08 PM
Wow I am full of fail. Turns out code 15 is the coolant sensor. Now that should be easy to fix!

Thanks Darthfiero for the heads up. I don't know what chart I was looking at for the past 8 months.... O_o
Jncomutt MAY 13, 07:11 PM
Would also explain the bad running when hot. Hopefully that fixes your drivability too!
Hudini MAY 13, 10:39 PM
When I modified my intake and added a bigger throttle body I had to adjust the ASYNC FACTOR vs COOLANT under the FUEL AE heading in Tables/Functions. Mine was stalling at throttle tip in unless I pushed it veeerrrryyyy slow. This was using $8F and the 1227730 with DIS and a 56mm throttle body.
Francis T MAY 14, 08:10 AM
Check the impedence of your MAT sensor. I had one go bad once that drove us crazy when we were burning some new chips for a special aplication. We thought it was our chips. The MAT kept giving the ICU bad readings; like telling it it was 110+ deg when it was only 30 or below deg and so forth and thus on our wideband I saw the A/F ratio was all over the place; one min it was too lean then too rich etc. I replaced it and all was fine.
BTW: sand blasting it, I knew I checked that intake it held pressure good.
lou_dias MAY 16, 12:38 PM
Code 33(oops code 15) came back on a longer drive.

It turns out the engine builder used pipe-dope on my coolant temp sensor which needs to ground out to the block. Andrew (mtownfiero) saw the potential issue right away. I had brought a brand new sensor with me anyway and he put silicon on it and now NO MORE ENGINE CODES!!!!

I was having some issues with the old Fiero computer with this sensor but it seems the '7730 relies on it much more. Problem solved.

Once we fixed that, we did some data-logging and sent a new file to DarthFiero. Right now when I floor the pedal, I have some power ~2000, it dips ~3300 and comes back up ~4600 so some tuning is definitely needed. That was using the seat-o-da-pants meter.

Yes, the car drives almost like 98% normal now. When I go to neutral after accelerating, the rpm do dip to 400rpm and the belt squeals before going back to idling between 675 and 700rpm though. Any thoughts there?

Edited for correct code.

[This message has been edited by lou_dias (edited 05-17-2010).]

Francis T MAY 16, 06:02 PM
Try putting a vacuum gauge on it then dump the throttle, that big TB may too big for sudden full throttle and make it bog just like using too big a carb will.
lou_dias MAY 17, 02:37 PM

quote
Originally posted by Francis T:

Try putting a vacuum gauge on it then dump the throttle, that big TB may too big for sudden full throttle and make it bog just like using too big a carb will.



Oops meant code 15. Problem is solved.
lou_dias MAY 18, 08:01 AM
The only problem I seem to have is a miss as I accelerate. More pronounced at low rpm, seems to go away at 4500+rpm when a big power surge happens. Seems like the flood gates open for power then as it seems to decline from 3000 to 4500. Bad spark plug?

With my shaky Dakota Digital install, I occassionly lose VSS and trip code 24 as well. Recall, I'm using Archie's 6-speed proto-type before he wired in the amplification circuit.
lou_dias MAY 27, 03:14 PM
Well, it throws codes 24, 33 and 43 now after 20 minutes of driving. Pretty weird. Very dissapointed 33 came back but I suspect the timing may be causing some early ignition and back-pressure thru the valves and back up into the intake. This could be triggering the 43 as well.

I'm waiting for DarthFiero to send me a chip with modifications based on a data-log Andrew sent him.

With the code 24, that's VSS no signal. Darth's chip will put in the 60,000ppm value and we should be able to run the VSS back into the ECM instead of the Dakota SG-1 that came with the 6 speed conversion.