Question about 1999 Honda Accord

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Slips between gears.

Began slipping between first andsecond gear but only when the engine was cold, i had the tranny flushed and service which seemed to help. But after a long driving trip it began slipping between each gear no matter what the temperature was. A mechanic told me to change out the motor mounts because the originals were wearing out. so i did. it still slips between gears, no another mechanic is telling me it is the shifting solenoid or the transmission linkage. i fear the worst (new tranny) hope for the best, any advice?

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  • nolanwilson Dec 17, 2008

    its a 1999 accord, its got close 200000 miles, i'm the second owner, had it for 8 years, i've treated it pretty well as far as maintainance, oil changes and the such. its gone alot of miles though.

  • nolanwilson Dec 18, 2008

    is the solenoid something i can change myself or is that something for a shop?

  • jah_ling Feb 09, 2009

    i have the same problem right now wat to do?

  • 42windowman May 11, 2010

    Ok - first off it is not the motor mounts and do not go back to this mechanic. I would suspect the torque converter or belts are shot in transmission which essentially means it is done. What kind of car how many miles and how has it been treated??Wait to hear from you

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Well I guess I will say change the fluid again and change the filter- you simply do not have enough miles to be transmission failure- so my guess wil be the shift solenoid as well - contact dealer to confirm.They will have to change with solenoid anyway.I sold my last honda with 275,000 miles and it had a hard life- no issues ever

Posted on Dec 18, 2008

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1990 jeep Cherokee limited 4.0 4x4. auto tranny quit pulling, all at once; no warning, any ideas?


Look at the shift solenoid or oil screen/filter. Oil bad need flush and new oil. Over heater clogged oil cooler. Burned tranny clutches. Start on the oil

Sep 15, 2015 | Jeep Cars & Trucks

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Tcu


what does stops, mean.?> .. skids to stop?
fails hot or cold engine or both? ever to the Full flush service every 50k?
its an A/T and as such , is very complex. (buy M/T?)
are you asking for guessing? or tests?
there are only 2 ways, ask, for DIY or read the FSM.
so what gears fail. slip or shift late or early? lots of gears.
report all actions of all gears and slip for sure.
what is slip?, that is when the RPM of engine rises faster
and MPH lags. called slip or in tranny lingo FLARE !

Did you insert the tranny diagnostic jumper and look for flash codes. per fsm? (on new cars this moved to PCM DTC's)

the FSM has s huge list of symptoms, about 10x and engine.
and 100s of pages.
i dont do A/t rebuilds but i must know how to test them on car.
the FSM covers that.! fully.... no need to guess., at all, read it.

Here i will make some simple review on those first pages
first, we do the stall test. see FSM.
brakes (both) hard set into front wheel chokes, car most not move
dig?
you then (fsm says) slam down the throttle. Low. (and others)
and watch ENGINE RPM
this is like 1500 -2000 (read the book, this number is a avg on cars)
this proves the tranny slips, do so for 5 seconds max.
this makes lots of heat in the tranny , RTM.
the next step is to check actual Tranny pump pressure at the ports
if this fails, the tranny needs to be changed out. (in most cases)

now the TCM. the FSM shows the pins.
The TCM is a tranny puter. (a transmission brain)
it has inputs and the outputs & shifts the tranny in all ways.

we first check that the outputs (a $10 voltmeter) are correct.
if correct and the tranny messes up?, it s a bad tranny
if incorrect we then check the TCM inputs.
if they are wrong, we correct that first.
the rule of GIGO works , for all computers, garbage in , nets garbage out. GIGO, so if the tail sensor is dead the TCM goes to limphome
and skips gears.

easy ,huh> the tranny has many ON CAR test
the above is just but a few, but very important.


alldata.com (fsm like)

also on some cars the OD lamp flashes or the D light? flash
to tell you, THE TRANNY BRAIN, has errors stored, please
do get them and read them, each are very important.
no matter what do the scan (new cars) and all old cars
the TCM diag jumper routine.. do so regardless.. of any trans issues.
never trust any CEL lamp or OD flash, scan it,

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1 Answer

2001 kia sephia slips out of gear. Trouble codes P1500, P1624, P0740.


Low fluid or too much ATF? (foaming it up and killing bearings)

p07xx is tranny DTC codes. (errors)
TCC lockup failure. (the TCM commanded the lock and
the tail shaft sensor did not rise in RPM
that is the engine RPM does not match tail RPM or 1:1 ratio.
which is LOCK ratio.

1500 is speed sensor , reads wrong,
No Vehicle Speed Signal to TCM.

1624 means.
MIL Request Signal from TCM to ECM.
the means simply the Tcm SAW and error and sent that error up stream to ECM. creating 1500.
remember the ECU never knows what part is bad.
NEVER ! it only knows, the tests failed. (monitors)
the first thing i do is find out which VSS failed.
on some cars there are 2 to 5
the first speed sensor is RPM does the scan tool show correct engine RPM? y/n
if yes,
does the scan-tool show correct MPH? sensor 2.
y/n if not fix that first.
the TCM function (tranny brain must not be lied to, in this order)
engine RPM , MPH.
and last the tranny its self as VSS (rpm) sensors. 1 to3.
my guess, (too lazy to look it up) has 1 sensor on the tranny tail.
if all is good and 1500 means VSS 2 tranny tail is fibbing.
then its one of 3 things.
(all others good)REMEMBER the TCM does comparisons to all speed sensors to shift the car correctly so the front sensor count first. then last the rear.
VSS2 lies. this is bad bad tranny (slips) bad wires to VSS2 or bad VSS2.
most TCM go to limp home when the tranny slips to stop burning up the clutch packs. may skip gears too.

now what does slips out of gear mean. a neutral FLARE?
or down shifts,
if the tranny ever slips. this is bad news.
if it does slip 1500 is only the warning that it did
it say RPMs go out of control and threw 1500 pronto.

Try to think(sic) like a TCM what would you do if the tranny malfs.
answer, throws codes.
and goes to limphome, if necessary, (FSM show these facts)
so does alldata dot com
what i do is try to get tranny to slip. using all gears.
if it slips ,its bad.
The TCM can not run a slipping tranny.
the TC does slip, but the TCM has that all figured out. (modeled)
not locked, and locked it must not.
good luck and do ask questions.

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1 Answer

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Valve body in the bottom of the transmission has valves that ware out and the oil is thick when it is cold and when the oil gets hot it gets around the ***** out valves thus shifting back in to first could be the 2-1 downshift valve.

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