Question about 1993 Cadillac Eldorado

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Trans works good when warm outside but if temps get low then it only drives in 1st, 2nd and reverse. Is there a bad valve body or does trans need all new seals? Car only has 66000 miles.

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May only need fluid drained and filters changed.

Posted on Sep 30, 2010

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I have a 4.3L V6 automatic transmission at 99,000 miles. Yesterday when I started it and put it in reverse, it took a few seconds to engage into reverse. Even then, it still didn't feel fully engaged. Then...


You could and should have changed the fluid,so
it is clean
Add a bottle of RED LUBGARD

Next thing to try is cleaning the valve body
as it has sediment in it and the cold temp
as well is hanging the valves

The bad part on almost all trans valve bodies is that
half the system is in the case and you lose the check
balls working in the vehicle.
You will need a schematic of balls positions so you
can stick them up there with vasoline or trans gel,
then install the valve body

After that you pull the trans and to the same with
the pump or just rebuild it

Feb 05, 2011 | 2000 Chevrolet S-10

1 Answer

Is it worth fixing a 2000 chevy silverado that has 200,000 miles - It seems to have a transmission problem


If the engine and body is good, yes and depends on your transmission issues.
Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST. This guide is meant for problems that do not show up as PCM codes (like shift A&B solenoid failures, for example).
he transmission is on the same fuse as the MAF, O2 sensors and at least one other sensor - if an O2 shorts out, it will blow the fuse and the trans will go into limp-home mode. Be sure the trans has power and the fuse is not blown before doing anything else.
Note that many problems that show up as transmission issues are actually PCM or electrical, and may be external to the transmission. Try a different PCM, and check for chafing where the cables come out of the PCM
Put a line pressure gauge ($55 shipped on Ebay, or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan)
What is "limp-home mode" ? This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.
Thank you for using fixya and good luck

Apr 20, 2010 | 2000 Chevrolet Silverado

1 Answer

THE TRANS WHEN HOT SOMETIMES SHIFTS HARD BUT NOT ALL THE TIME COULD THIS BE A BAD SHIFT SOLENOID ?


No it could be a bad TPS or EPC valve.
Check TPS (throttle position sensor) for smooth and linear electrical response over the entire range of motion. If the response is jumpy or erratic at all, replace TPS. If not, your EPC (Electronic Pressure Control) solenoid failed or has a dirty screen. Easy fix in pan. Fix as soon as possible or hard parts will eventually break.
Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST.
Secondly, put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan).
Thank you for using Fixya and good luck. Keep me posted, be glad to help you get your truck running 100% again soon.

Mar 20, 2010 | 1997 GMC Sierra

1 Answer

Shifts hard only some times when cold or hot from 3rd to over drive the truck has 130,000 miles and is a 2000 chevy silverado 2500 6.0L


1-2 shift is delayed and harsh, may not shift into OD: Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace or EPC (Electronic Pressure Control) solenoid failed. Easy fix in pan. Fix as soon as possible or hard parts will eventually break. Start with the simple and check the transmission fluid level and condition.Secondly, put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan).
No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter : ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

Good luck and keep me posted.

Feb 17, 2010 | 2000 Chevrolet Silverado

1 Answer

I have no reverse on my 1998 chevey blazer 2x2


Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST.

Secondly, put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a 0.490 or 0.500" boost valve (easy fix in pan).

Slow, slipping or no reverse: “lo-reverse” clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell. It is possible to remedy a fluid problem by removing the checkball from its cage in the case in the rear of the trans may help (must remove valvebody), or adding a high-viscosity additive such as Lucas Transmission additive or other seal restorer product. May also have worn boost valve (can replace in the pan).

Good luck and this should be a easy fix unless it's your sunshell that has gone bad, and call around for a transmission shop you can trust.

Feb 03, 2010 | 1998 Chevrolet Blazer

1 Answer

Why does the transmission slip when it gets warm


Soft shifting, gradual performance degradation: Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Transgo HD2-C kit fixes first two without removing trans. Seal restorer may fix last problem, but probably R&R. Also try a transmission flush with BG brand products (Firestone stocks it).

Secondly, put a line pressure gauge ($55 shipped on Ebay, or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan).

Good Luck and keep me posted.

Nov 25, 2009 | 2000 Isuzu Trooper

2 Answers

Is the overdrive solenoid on a 95 JGC accessible, externally?


no. its part of the valve body inside of the transmission. you would need to drain and remove the transmission oil pan and then remove the valve body. Best left to a transmission shop or reputable repair center.

Aug 10, 2009 | 1995 Jeep Grand Cherokee

2 Answers

95 GMC Jimmy 4L60E no 2nd or OD 4L60E


do u have any trouble codes for the trans? u need to find out to see if a shift solenoid (possible 2-3) has failed.

Apr 15, 2009 | 1994 Pontiac Firebird

1 Answer

2000 jeep grand cherokee laredo hesitates in 2nd gear when cold


Is it manual or auto trans? If manual the gear lube is thicker when cold and the syncronizers tend to stick and not slide free for grind free shifting or for locking into gear.
If Auto trans if the jeep is warmed up setting then cycle the gears before driving. If that helps then the fluid is not getting through the valve body properly. It could be metal in the body or filter or cold seals are letting fluid by til the seals warm, expand and hold pressure. I'm assuming trans fluid is good, not old. One item that can lead to poor cold shift in an auto trans is a bad torque convertor. Since it seems to be a second gear issue the second section of the trans could have a bad seal. In an auto trans I'd take to a shop and have a cold pressure test done. They will tell which one is the problem.

Mar 20, 2009 | 2000 Jeep Grand Cherokee

1 Answer

1999 DODG 3500 AUTO TRANS SHIFTS TO 2ND WITH A LITTLE HELP


I have a 1999 Ram B 1500 Van, auto transmission, 5.9 L engine.
Same problem, trans hesitates in 2-3 upshift, sometimes 1-2
to 2-3 upshift. Posts trouble code P1756 - Transmission Govenor pressure too low at below 15 to 20 Psi. Transmission pump shot or valve body leak stops trans from reaching proper pressure to shift, which is minimum 15 Psi.
Either trans is leaking in valve body, valve is stuck, shift solenoid on valve body is sticking, or pump is shot.

Feb 14, 2009 | 1999 Dodge Ram

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