Question about 2000 Ford Expedition

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Torque converter or wiring problem affecting speed

When driving truck doesn't sift doen in gear...at 50 miles a hour the RPM is up to 3000...then it overspeeds so i hit the overdrive button and it will let me go up in speed but RPM goes up to 4000 +. Sometimes it just start working but lately it doesn't. i have auto start on my truck but i don't know its affecting it.Can it be a blown fuse or loose wiring. Someone told me it might be the torque converter might have a loose wire. What can i do?

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Tcc solenoid is crapping out take it to a mehcanic or pull the pan solenoid body assenbly and replace the tcc torque converter clutch pressure solenoid

Posted on Mar 11, 2009

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What should the rpm be at in a 1998 iszue rodeo at 70 it is a 5 speed 4x4


It is impossible to calculate with out knowing the over drive ratio (5th gear) and the diff ratio and tire size but with most vehicle with 5 speed boxes it should be in the 3000 to 3500 rpms range
The average vehicle at 74 miles/hr or 120 k/h runs around 3200 rpms
it doesn't matter how many cylinders or if 4x4 or make of vehicle , the rpms is tied to the ratio of the gear and the diff and the circumference of the tires
Sorry , it cannot be more exact than that

Dec 31, 2015 | Cars & Trucks

1 Answer

'98 Pontiac Grand Prix SE PO742 torque converter clutch solenoid circuit stuck on Trac off light and service engine soon light stay on


When the PCM detects 3 occurrences of TCC slip between -20 and +50 RPM for 5 seconds, indicating the TCC is applied, when commanded OFF, then DTC P0742 sets. DTC P0742 is a type B DTC.
The PCM energizes the Torque Converter Clutch Solenoid Valve Assembly (TCC Sol. Valve Assy.) by creating a ground path on circuit 422. When grounded (energized), the valve stops converter signal oil from exhausting. This causes converter signal oil pressure to increase and move the TCC apply valve. The TCC Sol. Valve Assy. de-energizes when the PCM no longer provides a ground path. When de-energized, the valve will exhaust fluid and release the TCC
Diagnostic Aids
?€¢
Check for PRNDL DTC P0705. DTC P0705 affects transmission operation. This may set DTC P0742 falsely.


?€¢
Inspect the transmission fluid for debris.


DTC P0742 Torque Converter Clutch System Stuck ON Step
Action
Value(s)
Yes
No

1
Was the Powertrain On-Board Diagnostic (OBD) System Check performed?
--
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check

2
Install the Scan Tool .
With the engine OFF, turn the ignition switch to the RUN position.
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data. Record the DTC Freeze Frame and Failure Records, then clear the DTC.
Start and run the vehicle.
Select TCC Slip Speed on the scan tool.
With the transmission in D4, drive the vehicle through the 1-2 upshift.
In second gear is the TCC Slip Speed within the range specified?
-20 to +50 RPM
Go to Step 3
Go to Diagnostic Aids

3
Inspect for the following conditions:
The TCC apply valve stuck ON because of sediment or damage.
The TCC Sol. Valve Assy. stuck ON because of sediment or damage. Refer to Control Valve Body Assembly Inspection, in Unit Repair.
Was a condition found and corrected?
--
Go to Step 4
--

4
In order to verify your repair, perform the following procedure:
Using the scan tool, clear DTCs.
Operate the vehicle under the following conditions:
• The gear range is D2, D3 or D4.
• The commanded gear is not 1st.
• The engine speed is greater than 500 RPM for 5 seconds.
• Not in fuel shut off.
• The engine torque is 95-270 N·m (70-200 lb ft).
• The throttle position is 14-50%.
• The PCM commands the TCC OFF.
• The TCC slip speed is 150-2000 RPM for 5 seconds.
• The engine speed is 800-4000 RPM.
• The vehicle speed is 32-112 km/h (20-70 mph).
• The speed ratio is 0.65-1.18.
• The last gear change occurred more than 3 seconds ago.
Select Specific DTC. Enter DTC P0742.
Has the test run and passed?
--
System OK
Begin the diagnosis again. Go to Step 1

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1 Answer

Lost my top gear in 1998 bonneville runs at 3000 rpms @ 70. help car has 237xxx miles motor still strong


The torque converter has clutch plates in it that wear down so you loose the over drive function with high miles. The transmission can also not be sending the pressure to apply the clutch in the torque converter.

Mar 09, 2015 | 1998 Pontiac Bonneville

1 Answer

1998 lexus gs300 runs at 2800 rpm at 65 mph


At a steady 65 mph, the torque converter clutch (TCC) is engaged. When you accelerate, the ECU disengages the TCC to gain extra torque for acceleration and then re-engages TCC when speed is steady. Its kind of like having an extra gear.

Jan 03, 2014 | 1998 Lexus Gs 300

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Sounds like the problem lies in the catalytic converter, a bad catalytic converter that restricts the flow of exhaust gases from the engine and limits the power and speed of the vehicle. If you need more help on how to repair your catalytic converter, I would suggest checking out this site How To section Repair catalytic converter - Buy Auto Parts

Oct 29, 2013 | 2000 Hyundai Accent

1 Answer

2004 saturn vue at low speed engine rpm up and down


I have the same problem with my 04 v6 awd vue.
The issue i see is with the transmission torque converter going in and out of lockup consistently. I have noticed when i engage cruise control this problem goes away for the most part. Today i turned on cruise at 30 miles per hour after noticing the rpm fluctuation about 400 rpm. change to only about 100 rpm. This has been an issue scene day one from the dealer. no codes, the transmission has not failed nor the torque converter. I think it is an issue with the drive by wire system. when you engage cruise control the foot throttle position sensor is out of the equation. This is my best guess, you can take it with a grain of salt.

Jan 25, 2012 | 2004 Saturn VUE

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Espesific location of turbine speed sensor on transmission 1998 cadilac deville


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Mar 11, 2011 | 1998 Cadillac DeVille

1 Answer

Hi. I have an '82 F-150 with a 351 c.i. engine, the extended cab version with the full-length bed, 4WD, with only 20,000 miles on it. When I'm driving about 70 mph, the tachometer reads 3000 rpm, which...


Hi

It does look like you have a 3 speed C6, if the PRND21 description is correct. If you do have overdrive, the "D" will be printed in a white oval.

Sounds like it is OK. My Mustang has a 351C with a C6 trans, and 3000 rpm is about right at 70mph.

The defining factor on the rpm will be the Differential gears, which in a truck, might very well be taller gears instead of highway gears, as the taller gears provide more power output at the axles than the highway gears do.

Example:
if you had 3.0 to 1 gears (Highway), that means that the driveshaft will turn 3 times for every complete revolution of the rear wheels(Axle)

If you had 4.0 to 1 gears, then the driveshaft would turn 4 times for every revolution if the axle. Lots of torque for pulling stumps, but on the highway. the engine will have to turn more rpm's to maintain 70 mph vs a 3 to 1.

with the 3 to 1, you will turn less rpm's on the highway, but will have less available low speed power (Torque) at the wheels.

Sounds like the truck is doing fine.

Jun 04, 2010 | 1982 Ford F 150

1 Answer

Stalls


he diff between a lockup vs non-lockup torque converter is the lockup simply locks the torque converter to the transmission direct electrically so there is no slippage in high gear. And there is no advantage to using a 2300 rpm stall converter if you are running a basically stock cam. However if you insist on this high stall speed torque converter you'll be able to lay down some impressive black marks froma standing start! One final note...unless you change your rear end gears your RPM's at a given speed remain the same. All the 2300 rpm does is your motor will rev a bit more before you start moving

Jul 06, 2008 | 1994 Chevrolet Beretta

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