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We just put a 05 5.3 in my brothers 2000 ext cab z71. the mottor runs great but its starting to idle funny sometimes it idles around 700 other times around 1000 rpm. Also when you ridiing down the road and you level out at say 55 it revs up and down a little you can hear it in the exshaust. And when you floor it sometimes it boggs out a little and you can feel it slowly picking up then other times you floor it it'll ride out. Ne one know or have any ideas
is it thowing any DTC's??
could be O2's maybe, check your plugs, maybe get some injector cleaner, id start with the small things first.
some info would be great ;)Quote:
Originally Posted by acechevy
is it just a stock 5.3?
is there any other mods to it?
who's tuning it?
everything is stock besides the converters are missing and the the single in dual out flowmaster. And it has the check engine light on but the converters are out also. He just bought the truck a few weeks back the 5.3 that was in it had a cracked head so we stuck his 05 5.3 that he had bought for his regular cab in it didnt have but like 45k miles on it. Some time when it goes from first to 2nd gear it has a very hard snatch then other times it dont so im thinking what ever messing with the ideing has something to do with that also. My friend is looking for his codes checker but soon as we get that on there ill post the codes that are being thrown. Thanks
did you do the crank sensor relearn after you put the 05' motor in? the snatching hard in 2nd makes me think its something else though
Is it possible that maybe the 05 ran different size of injectors than the 2000. Maybe a vacuum leak, did you get to read the codes yet?
BB
who's tuning it? sounds like or could be a tuning issue
no i didnt do the relearn. we still looking for the scanner. and it has the stock pcm no tune!!
They are the stock injectors. And my dad's 4.8 does that on occasion as well, he just turns the truck off and back on and it shifts normally. I know that's not a fix. Also his truck is completely stock. I always just figured his tranny was going out. Although I did recommend taking it to chevy for a reflash...just incase the ECU was messing up or something.
really that kinda makes since y it some times bogs out i just got rid of my other injectors to that sucks lol.
pulled the codes and this what they were
po335
po420
91870
po430
P0335 means a crankshaft sensor relearn/calibration needs to be done. Dealer or anyone with HPTUNERS software can perform that.
p0420 and p0430 says bad catalyst efficiency. Either they're not hooked up or defective or cats are plugged possibly if not hollowed out.
91870 ? awful large number there.
P1870 is transmission component slippage, torque convertor.
sorry lol its p1870 lol. So what wpould have do be done retuned or just relearned?? Could we put the other crank sensor back in?? And the trans what its saying the torque convreter is bad need to be replaced?? Cause the trans just was rebuild a few months back.
need to relearn it. either put the rear sensors back in or get them turned off in the tune. Trans may not be an issue once the other two things are fixed. Fix them first and then see if the trans code still comes up.
ok thanks we will start there
I'm sure some local shop can run the relearn for you, I know that our snap-on scanner had this ability.
BB
i eraced the codes yesterday the only one that has came back as of today is the p1870 or the trans one. Is there chance that the relearn code was thrown from the last motor that was put in it cause the guy that we got the truck had just put a lkq engine in it and water in it and it froze and cracked the head so thats when we got it and put our 05 5.3 in it. Or does every motor put in it have to be relearned??