Kirmetoads94
Newbie
Hey fellas, I bring you here today because I am at my wits end with this swap and am about to go back to my black box and pout until the end of time.
I have a 1997 Suburban that I keep very well maintained and super clean. It ran very well before this PCM swap, I chose to do it because of the tuning capabilities and most important (to me) the Tow/haul mode and E-fan control.
I started by ordering a 411 off of eBay from a "reputable seller" that promised to have every specification from the buyer put into the computer.. well I'll tell you that wasn't the case. A few weeks went by and my own tuning software came in and I jumped on it and my tune was a mess. I grabbed a stock 2002 Express van bin from the repository and flashed it to the PCM to start from scratch.
As soon as I got to a point where I could finally turn the key the thing ran like S**T, ok no problem the EGR isn't hooked up yet (97 EGR is controlled differently ~add wire) so I got that done and it seemed to run better. but that was short lived...
I took it out for a test drive and about 5 minutes into driving I realized that I had serious problems. The SES light started flashing and the truck kept going in and out of lock up and I just watched as my transmission temp sky rocketed. I limped it home and read the codes P0300 and another one for cylinder 4 misfire (How? it was fine before the swap???) The suburban started idling very badly, it felt like it couldn't stop surging.. So I figured it probably needed a CASE relearn so I grabbed my Tech II and did it.
Here's the cool part, now I dont read any misfires at all but I can literally still feel it surge at idle and overall just has a rough idle to the point that I feel uncomfortable driving it. It doesnt go in and out of lock up anymore on the hwy but right around 30-35mph it'll do it for a split second and I cant seem to get my scanner to see why....
I have checked all the wires to make sure they're in the right place countless times and I'm 110% certain its all right. The spreadsheet I got from Lextech says that the EGR and EVAP are controlled differently than in 98 and 99 and the 411 PCM doesn't support them. Can the evap cause my rough idle issue? I have so many questions and I cant seem to find ANY answers for them.... So please..... Help!!
Things Ive checked /replaced:
Fuel pump pressure 58PSI
MPFI upgrade
New Plugs, wires, cap, rotor, and fuel filter
Cleaned EGR
Timing is dead on at 0*
I have a 1997 Suburban that I keep very well maintained and super clean. It ran very well before this PCM swap, I chose to do it because of the tuning capabilities and most important (to me) the Tow/haul mode and E-fan control.
I started by ordering a 411 off of eBay from a "reputable seller" that promised to have every specification from the buyer put into the computer.. well I'll tell you that wasn't the case. A few weeks went by and my own tuning software came in and I jumped on it and my tune was a mess. I grabbed a stock 2002 Express van bin from the repository and flashed it to the PCM to start from scratch.
As soon as I got to a point where I could finally turn the key the thing ran like S**T, ok no problem the EGR isn't hooked up yet (97 EGR is controlled differently ~add wire) so I got that done and it seemed to run better. but that was short lived...
I took it out for a test drive and about 5 minutes into driving I realized that I had serious problems. The SES light started flashing and the truck kept going in and out of lock up and I just watched as my transmission temp sky rocketed. I limped it home and read the codes P0300 and another one for cylinder 4 misfire (How? it was fine before the swap???) The suburban started idling very badly, it felt like it couldn't stop surging.. So I figured it probably needed a CASE relearn so I grabbed my Tech II and did it.
Here's the cool part, now I dont read any misfires at all but I can literally still feel it surge at idle and overall just has a rough idle to the point that I feel uncomfortable driving it. It doesnt go in and out of lock up anymore on the hwy but right around 30-35mph it'll do it for a split second and I cant seem to get my scanner to see why....
I have checked all the wires to make sure they're in the right place countless times and I'm 110% certain its all right. The spreadsheet I got from Lextech says that the EGR and EVAP are controlled differently than in 98 and 99 and the 411 PCM doesn't support them. Can the evap cause my rough idle issue? I have so many questions and I cant seem to find ANY answers for them.... So please..... Help!!
Things Ive checked /replaced:
Fuel pump pressure 58PSI
MPFI upgrade
New Plugs, wires, cap, rotor, and fuel filter
Cleaned EGR
Timing is dead on at 0*