Ram4Pick

I've had the two installed for about a week now using the HPP 87 tuning and GMS maf with out any problems. Yesterday I installed the HPP 93 tuning and tonight I get an SES. I decided to check and see if it was the 93 tuning and it was. I put the stock tuning back in the truck and the SES light went out. I then installed the 87 tuning and the SES light stayed out. Did the combination of the 93 tuning and GMS maf caused a lean condition? Or something else? I have read that the two used in Camaro's does cause problems. I read an article about a Camaro LS1 build up, they installed an intake, exhaust, HPP and finally a GMS maf. Each mod did make more power but the most power was created when the HPP tuning was taken out and the GMS maf was left installed. I may try that, the GMS maf I have does have the more aggressive cold air tuning. I may take the HPP tuning out, leave in the raised shift points in and leave the GMS maf in to see if it is better that way. I'll keep you posted.
Jim

JWRENCH

I'm not sure why you had that problem. I've got pretty much the same set up on my truck except I've only been using the 93 setting. I've had it that way for several months now though and the highest I've seen my long term fuel trims go is +7 which is nowhere near the +25 it would take to set a lean code. If there were a small air leak behind the maf it would cause a lean condition. Did you check all your clamps real good? Also if you moded your egr tube check it too for a small leak. Are you positve it's a lean code, and not a knock code or something?

Ram4Pick

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Are you positve it's a lean code, and not a knock code or something?
</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I have no idea what caused it, I was asking if maybe it was a lean code, don't know. The truck owners manual stated that if the SES light goes on and stays on steady with out blinking, it's caused by something wrong in the emissions system. The truck ran fine but that was the only thing that had been changed. The maf connections and EGR mod are fine, no problems there. It may be pure coincidental, but the SES light went out when I took out the 93 tuning. When I thought I was selling my truck, I sold the HPP and GMS maf I had. When I decided to keep the truck, I bought another HPP and GMS again (stupid, I know). With the old HPP and GMS, I ran the 93 tuning and maf together with out any problems. The first GMS maf was one with out the "cold air tuning". I was just wondering if the more aggressive tuning the "cold air tuning" used in combo with the more aggressive tuning of the 93 setting on the HPP caused the problem?
Jim

XLR8NSS

iTrader: (4)

My Dad use to have that combo on his truck.(GMS - HPP3 93 tuning). It had so much knock retard it wasn't even funny. I had it everywhere at part and full throttle. The kr would jump to 8* and not come down. I took out the 93 tuning and all was well.

Both items cause the motor to lean out and the computer to add timing. Maybe some trucks are rich enough from the factory to handle it but, I think alot of others have experienced your problem also.

John

XLR8NSS

iTrader: (4)

BTW - Have you scanned to see what the SES light is being caused by? I don't know if excessive kr can set it or not.

John

PS - Nevermind, I see that you posted while I was typing this up. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

<small>[ December 22, 2002, 12:33 AM: Message edited by: XLR8NSS ]</small>

Ram4Pick

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">BTW - Have you scanned to see what the SES light is being caused by? I don't know if excessive kr can set it or not.

</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No, I don't have a code sanner. If it comes back with the 87 tuning installed, I'll take it to my mechanic and have him see what's causing the light. I my just see how the truck runs with no HPP tuning and the GMS maf. I'll still use the raised shift point of the HPP, which I believe may be a better benefit than the HPP tuning any way.
Jim

XLR8NSS

iTrader: (4)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">I'll still use the raised shift point of the HPP, which I believe may be a better benefit than the HPP tuning any way.</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Agreed. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

John

JSmith

iTrader: (5)

I have to agree, although I don't have any dyno numbers to prove it. I think the shift point adjustment gains far outweigh the tuning. I'm going to keep an eye on this thread because I'm curious to see what happens.I plan on taking out the tuning on mine and leave the shift points in, been thinking about it for awhile. I've also been running a GMS maf with the 93oct tuning for about 2 years and I've had a few SES codes. I'm also trying to get to the bottom of why my truck shifts from 1-2 like I was feathering the clutch...I have an automatic. I'm not sure if it's the tuning or maybe the knock sensors adding to much timing. BigKid suggested maybe the vette servos, which I planned on anyway, might help the shift problem but I'm still curious to see how the truck runs with the tuning out.

Maxmumboom

It is possible that if you are running the Maf/HPP3, and you not running a high octane, you would have knock retartd. It is also possible that you are running lean too if you have that setup. Try burning out your tank of gas, and get either 93 or if you can sunnoco 94 + octane boost. if you run the MAF and the HPP3 with the higher octane, you should be ok. That also would tell you that thats you problem. Try using your stock MAF + the HPP3. You shouldnt set alean coode then, and youll still make about the same power. I ran a Grann MAF with my s/c, and a saw a major loss in top end until i switched back to the stock MAF.
Good luck, J

JSmith

iTrader: (5)

I'm running 93oct here in Michigan. I've never experienced any knock or pinging.