rpm's hover between shifts

driver · 11-12-2008, 04:50 PM

I've got a '90 2600i 4x4 and every time i shift it hovers for a bit, which results in a crappy shift every time,all the vacuum lines look good is there anything else that could cause this?

mudseeker · 11-12-2008, 08:35 PM

don't quite understand your problem.

driver · 11-12-2008, 08:52 PM

Every time i shift the rpm's don't wanna drop, it actually revs up for a bit then drop,no matter what i do it revs up a bit then drops down

87c10slammer · 11-12-2008, 08:59 PM

have you checked you throttle cable for kinks or frayed ends.. that will cause problems...

mudseeker · 11-12-2008, 09:06 PM

does it shift into gear fine?

driver · 11-12-2008, 09:20 PM

ya it goes in to gear fine, and i was poking around under the hood today looked at the throttle cable and it looked good. I manually turned it and it's got a bit of slack in it, i think I'll try some spray lubricant on the cable tomorrow,I'll get back to ya.thanks

87c10slammer · 11-12-2008, 09:44 PM

did you happen to notice the spring... how did it feel.. if you pull on the throttle by hand it should snap back... if it seems to go back slowly you eaher have a cable problem or a gummed up throttle body or weak spring

driver · 11-13-2008, 07:00 PM

ya when i turned the throttle it snapped right back I'm gonna go spray the cable with wd40 right now.Thx.

87c10slammer · 11-13-2008, 07:51 PM

you could have some badinjectors... they will keep sprayin when the throttle is let go... try running some injector cleaner like sea foam through the system using the brake booster... there is a video on youtube that shows the steps.. if you cant find it ill look the link up...

gmctrucks · 11-13-2008, 08:39 PM

On our extra MPV one of the transmission solenoids is bad and it causes that to happen but when I put in power mode it doesn't happen that's why I know it's that also when MPV trans fluid is dirty it will do strange things change out fluid with filter if you haven't done that and last if that doesn't help add a can of Lucas trans additive. I have written this before but to clean the trans before a fluid change add a can of Trans X it will leave the inside looking brand new might even fix a trans if it has to much junk in it I tried it once on sisters car and it fixed it car was taking off on second gear sometimes third gear.

11-12-2008, 04:50 PM	#1
driver Full Member Join Date: Nov 2008 Location: Saskatoon,SK Posts: 14	rpm's hover between shifts I've got a '90 2600i 4x4 and every time i shift it hovers for a bit, which results in a crappy shift every time,all the vacuum lines look good is there anything else that could cause this?

11-12-2008, 08:35 PM	#2
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,317	don't quite understand your problem. __________________ i'd rather be hunting

11-12-2008, 09:06 PM	#5
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 6,317	does it shift into gear fine? __________________ i'd rather be hunting

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11-12-2008, 08:52 PM	#3
driver Full Member Join Date: Nov 2008 Location: Saskatoon,SK Posts: 14	Every time i shift the rpm's don't wanna drop, it actually revs up for a bit then drop,no matter what i do it revs up a bit then drops down

11-12-2008, 08:59 PM	#4
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	have you checked you throttle cable for kinks or frayed ends.. that will cause problems...

11-12-2008, 09:20 PM	#6
driver Full Member Join Date: Nov 2008 Location: Saskatoon,SK Posts: 14	ya it goes in to gear fine, and i was poking around under the hood today looked at the throttle cable and it looked good. I manually turned it and it's got a bit of slack in it, i think I'll try some spray lubricant on the cable tomorrow,I'll get back to ya.thanks

11-12-2008, 09:44 PM	#7
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	did you happen to notice the spring... how did it feel.. if you pull on the throttle by hand it should snap back... if it seems to go back slowly you eaher have a cable problem or a gummed up throttle body or weak spring

11-13-2008, 07:00 PM	#8
driver Full Member Join Date: Nov 2008 Location: Saskatoon,SK Posts: 14	ya when i turned the throttle it snapped right back I'm gonna go spray the cable with wd40 right now.Thx.

11-13-2008, 07:51 PM	#9
87c10slammer Banned Join Date: Mar 2008 Location: levittown pa Posts: 2,197	you could have some badinjectors... they will keep sprayin when the throttle is let go... try running some injector cleaner like sea foam through the system using the brake booster... there is a video on youtube that shows the steps.. if you cant find it ill look the link up...

11-13-2008, 08:39 PM	#10
gmctrucks Senior Member Join Date: Nov 2006 Location: Houston,Texas Posts: 3,945	On our extra MPV one of the transmission solenoids is bad and it causes that to happen but when I put in power mode it doesn't happen that's why I know it's that also when MPV trans fluid is dirty it will do strange things change out fluid with filter if you haven't done that and last if that doesn't help add a can of Lucas trans additive. I have written this before but to clean the trans before a fluid change add a can of Trans X it will leave the inside looking brand new might even fix a trans if it has to much junk in it I tried it once on sisters car and it fixed it car was taking off on second gear sometimes third gear.