Re: disco 1 engine surges 650 up to 1200 back down to
Sounds like idle control valve or throttle position sensor. It could also be the engine ecu is faulty but the other 2 issues should be looked at first as they are less expensive to address if you are going through a process of elimination. I would suggest taking it in to have it properly diagnosed by a competent mechanic. try rovercannibal.com for parts when/if you need.
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we need vastly more symptoms then that,sorry
if the engine surges, that is first. (surges in 1 gear)
but if a transmission down shifts that is normal, rpm rises
(after all its a lower gear) (higher numeric ratio)
find any machanic in town
ask him test drive it.!
10 min.later he wilt tell you
its trans issues.
or its engine, super easy this is driving.
seems you can not, and learning is 1hour in car class..or 10x that lacking facts of drive train functions.
stop guessing. why spend cash on a useless sensor now.
spend cash on $1 shop diagnosis and WIN.
i promise !
or get it scanned.
and post all those DTC errors. P0700? and more.
1999 cavelier manual trans: My son was shifting his manual trans really rough (ramming through the gears to try to beat someone out at a light) and ended up not being able to put it into anything but 3 and 4 (straight up and down). We noticed that the shifter cable, that actuates the position of the arm on the transmission, had pulled away from a "c" clip and was not held into place about 8-10 inches down the cable away from the trans. The cable needs to be secured into that clip in order to let the wire inside move the trans. lever to shift. Otherwise you will be stuck on what ever "rail" your trans is on at the time of disconnection. It would be the first thing that I would check.
the grand vitara maf sensor is usually located in the intake air duct, from air filter to throttle body. mounted on the intake manifold. some maf sensors are mounted directly to throttle body. symtoms of a bad tps are---it will cause tranny shift issues, bucking, jerking, idle surging, engine cut off, hesitation on take off, surge while cruising down highway. have a good day !!
TCC solenoid is sticking. Very common with the 125C trans. If you want to just "get by" you can unplug the squarre plug on the front side of the trans and this problem will be gone. It is fine to drive that way - may lose a couple mile per gallon out on the highway but you can drive em forever that way
I am assuming that this is the trans you have. That it isn't an overdrive - no circle around the D?
have a 1998 K3500 silverado 4x4 with 454 motor and 4L80E transmission. I can not get over 55 or 60 mph. At that speed the transmission down shifts from 4th (OD) to 3rd. The speedometer also drifts from about 50 to 65. If I try to speed up it will down shift to 3rd. I have replaced the VSS on the trasfer case. Is there another speed sensor somewhere? Or could it be the TPS? The truck drives and shift normal up to this point. where should i look next. thanks