Question about 1988 Chevrolet Blazer

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Is it TPS or Trans

When check engine light comes my 88 Silverado K5 tranny will not downshift. It constantly shifts up to ODrive even at 5-15 mph then will not downshift unless you floor it. I like keeping it to the floor but there are times when you cant, like in town and in heavy traffic. Its driving me mad! Anyone with any suggestions post or email me. Thanks

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If your truck is equiped with one, have the transmisson torque converter relay switch checked.

Posted on Jan 21, 2009


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I have a 95 silverado c1500 with 4l60e trans and it wont go into overdrive

overdrive is the fourth gear.D1,D2,D3,D4 now drive truck at 80 kmh
cruise at steady speed no fuel pedal movement, downshift from D4 to D3 you should feel RPM raise .. after push brake pedal a little you should see RPM raise 300 to 400 rpm.
shift pattern is 1st gear ,second gear,3rd gear and lock up(torque converter clutch). 4th gear with lock up
hope it helps

Mar 29, 2014 | 1995 Chevrolet C1500

1 Answer

New 30rh transmission was installed in my 97 4.0l jeep wrangler and it shifts in all gears except for 3rd! even when it downshifts it goes through all gears but 3rd? please help

why not ask installer that.
btw , the TCM can fail and do that.
that is either a separate module or part of the PCM.

The TCM does all shifting. electronic, shifting it is.
the TCM has scan code errors, did you scan it and the PCM for errors.
if not , why not.????
2>3 shift failure.

even a loose or corroded , trans wired connector can fail.
or the tranny ground strap is missing.
saw a guy replace a tranny 3 times. and all 3 times failed.
he never knew the trans must be grounded perfectly .
his was missing, others simply broken, others rotted away.

what we do is make sure the TCM is sending the correct
voltage single 0v.12v, etc. to the transmission solenoids.
if not, the TCM is bad, or is in limphome. or inputs wrong.

TCM have what is called limphome that can skip gears.
my 4speed skips 2nd , in limp, by DESIGN !
all this is covered in the FSM, why not read it.
or look at it's there too.

i also have a switch box, i made., that attaches to the tranny
allowing me to make a manual transmission,
if that works the tranny is good.

the TCM will in fact mess up if its inputs are wrong
just like all computers do.
inputs are, TPS, VSS1 , VSS2, engine heat. shift selector switch PRNDL , and others.
The TCM shifts by the state of inputs. period

one cool thing, some cars pre 98, or so
the TCM is separate box. and with it unplugged
the shifter is now a manual transmission car. (for test or?)
have friends driving like this for 3 years.

Aug 04, 2013 | Jeep Cars & Trucks

3 Answers

Transmission shifts hard into second gear(auto trans). However, when shutting engine off and restarting, the hard shift will go away. It will come back in a few days. Doesn't seem to matter how many...

it may be a bad tps ( throttle position sensor ). it causes transmission shift issues, bucking,jerking, idle surging, engine cut off, surge while crusing down highway. if this does not solve problem, it may be a sticking valve body in transmission. have a good day !! for an automatic tranny.

Jun 10, 2011 | 1999 Chevrolet Silverado 1500

1 Answer

My transmission takes a while to shift around 40 mph. how can i fix it?

is this problem only when engine cold or happens also or only when hot?most simply ,shifts are determined by TPS(throttle position sensor)on engine throttle body,speed sensor(s)on transmission,and internal valve body.Trans should be serviced every 40,000km,we find that running trans on a flush machine often restores shifts and part throttle kickdowns if fault is not mechanical but caused by contaminated fluid as it gets most of the dirty fluid out of all the areas that a drain and filter change wont do.It is usually is best to get trouble codes checked for engine and trans.Which shift is it delayed in,2-3,3-4,does coming off the throttle help it change?is it upshift or downshift that is problem.This info will help in pin pointing problem better.hope this helps.

Feb 11, 2011 | 1999 Ford Explorer

1 Answer

2004 Durango dies and shifts weird

I will try to help..ihave a 2000 dodge durango with the 4.7 v8..My trans started shifting funny and the rpm's would go up to 2000+rpm when i was driving, which means i was getting really crappy gas mileage at 40mph..took it to shop, engine light on,put it on machine to a generic p0700 code plus a couple others..code basically says tranny is fn up..
Try this a cheap fix first that worked for me..on the transmission,driver side there are two sensors..input/output transmission speed be exact..they send info to computer to regulate shift points in trans..upshift and downshift..replace them both although one may be the culprit..cost at the dealer here in Delaware was $40.72 for one..there is one bolt(8mm)and one electrical connection to each..time to replace both about 15minutes you don't even have to jack up truck but you will have to get underneath.

Hope this helps and good luck..if you change them and find the tranny shifting properly..cycling the on and off switch will eventually turn off the engine light..just drive it normally i mean..go here shut it off..get back in start it up and will go out..good luck

May 10, 2010 | 2004 Dodge Durango

1 Answer

My tranny shifts at a high rpm than normal, and when i go slow, it downshifts really har

Do you have a check engine light on? It sounds like it might be a bad TPS

Apr 25, 2010 | 2003 Toyota Corolla

1 Answer

Been having some transmission issue with my 2009 CRV. First off about a week after getting it, I started noticing every time i took my foot off of the accelerator it would downshift, sometimes quite...

Find another Honda Dealer and tell them the trans doesnt shift right and it makes noise, go along with the tech on a test drive so he can feel and hear what your are feeling/ hearing.

Mar 11, 2010 | 1999 Dodge Intrepid

1 Answer

Been having some transmission issue with my 2009 CRV. First off about a week after getting it, I started noticing every time i took my foot off of the accelerator it would downshift, sometimes quite...

not nesacarily the d3 light do a trani service pan off and check for debri//constanly changing shift caracteristics usually mean trani degradation

Mar 11, 2010 | 2004 Honda Civic

2 Answers

Replaced TBI with Carburator, 4L80E wont shift

all u need to do is get a holley electric choke carb model i think is 4150 or 4160 and get the tps sensor adapter for it it is around $110 and the carb is around $290 ur trans shifts off of the tps. all the other sensors are useless. i had that same problem with my 94 silverado.

Nov 10, 2009 | 1991 GMC Suburban

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