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1993 Honda Accord

Tiny
MARTINEZXO
  • MEMBER
  • 1993 HONDA ACCORD
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 350,000 MILES
Is it possiable for the engine to run at a higer RPM with plugged catalytic convert. My 93 honda accord used to run at 2800 RPM at 70mph, now when I'm driving at 70mph the RPM are at 3400. What should a check for.
Tuesday, October 26th, 2010 AT 6:30 AM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi martinezxo,

Check the tansmission. Down shift to D3 and see if the rpm shoots up to confirm it was in 4ht speed.

A slipping trans and faulty lock-up would result in higher running engine rpms.

Did you check the trans fluid level?
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Tuesday, October 26th, 2010 AT 1:58 PM
Tiny
MARTINEZXO
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  • 4 POSTS
Yes, trans fluid is ok, yep when I shift to D3 it makes the RPM shoots up, is not slipping, and I don't what is a lock up. Help me out with that.
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Tuesday, October 26th, 2010 AT 9:49 PM
Tiny
KHLOW2008
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The lock-up is a syatem whereby the torque converter is locked to provide a direct drive drive between the engine and transmission to eliminate slipping when cruising or under low torque condition.

When cruising at a fixed speed, check if the rpm shoots up slightly, maybe an increase of 2 to 3 hundred rpm, when accelerator is depress slightly more to accelerate.

Is the D4 ( S mode if equipped) indicator is blinking while driving?
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Wednesday, October 27th, 2010 AT 9:58 AM
Tiny
MARTINEZXO
  • MEMBER
  • 4 POSTS
Is not S equiiped, and the D4 indicator is not blinking, yes when I'm driving at fixed speed it shoots up the rpm 2-4 hundred when I step on the gas or if I have the cruse control set at, let said 60-70mph and I come accrose an overpass or an uphill it shoots up the rpm. So what should I do replace the torque converter.
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Wednesday, October 27th, 2010 AT 3:09 PM
Tiny
KHLOW2008
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From symptom descriptions, the transmission and torque converter are working correctly.

Was any repairs carried out prior to the change in rpm readings?

Do you have any performance related issues?
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Wednesday, October 27th, 2010 AT 6:21 PM
Tiny
MARTINEZXO
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No repairs, I just start notice the change in the rpms and the gas mileage getting worst. No lights on, all of my cluster lights are off, the only one that comes on is the cruise control when I turn it on, that is it. When I start noticeing the higher rpm, I was told to do a tune up, so I did, and ever since a roll this car out of the car lot in 1993 I had always use genuine honda parts, everything, rotor, cap, wires, spark plugs, gas filter, trans fluid(change every 50,000 miles), belts, seals, power steering, racket pinion. Maybe is just too old 350000 miles. I even replace the ECU with an original, I did take both of the ECU out and open them up and did't see any burn transistors parts. Thanks for you help, please let me know if there is any thing I should check for.
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Wednesday, October 27th, 2010 AT 11:38 PM
Tiny
KHLOW2008
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A difference of 600 rpm is quite a lot and the only thing that can cause it would be slippage in the trans but those test carried out does not seem to indicate so.

If you had replaced the tires with different size from orignal, it could cause the problem.

Other than that, I can't think of anything else that can cause the problem.
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Thursday, October 28th, 2010 AT 9:01 AM

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