hey guys, i have a p61 ecu that was apparentlychipped and tuned on crome. it had a rev limiter if you will, set to 5500 rpm only in neutral, the previous owner said he set the real limiter at 9200 or something stupid, which i never hit. today i went out for a drive and in all gears a limiter kicks in at 5500. im confused as to how to just decided to creep over into working while driving. what could have went bad? and is it possible to get this ecu back to factory settings? :bang:
Sounds like the ECU is in ‘limp mode’ of sorts… Does the CEL come on when you turn to ACC, then turn off when you start the car? Have you checked for any stored codes that it could be throwing?
The only way to get it ‘back to factory settings’ would be to have someone burn you a chip that has an OEM map on it.
im in a pickle with that becuase my cluster shorted out last week and my speedo literally caught fire…so ill have to find a new cluster asap. how do you go about pulling codes on obd0/obd1?
car also runs normal, no power loss or anything… just hits a very early rev limit, which was never there before
Does your speedometer work? If not, that can be the issue right there. Vtec wont work, I know that for a fact.
my whole cluster took a poop so i currently dont even have one, i just wanted to run around the block and i noticed this happening, i cant even exceed 5500 rpms.
such an odd problem…
Was the ECU giving you this problem before the cluster issue? If not, I would assume it is a VSS-related issue.
IF you swapped this ECU in after the cluster had its little meltdown, it will be hard to narrow down the problem without a fully functional cluster.
As I said, a VSS issue will stop Vtec from kicking in all together, as well as any 2-step/launch control. So that very well could be the culprit.
If the ECU isn’t getting proper input from the VSS, it will put the car in ‘limp mode’ to prevent you from over-reving the motor and causing damage.
no the euc was fine before this, i always wanted to get rid of the hillbilly tune and chip in it. and the cluster has been in the car sence i bought it 8 months ago. ill have to take a ride to the city and get a cluster, and check out the speedo cable. thanks for your help