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-   -   carnor21 (https://www.hondaaccordforum.com/forum/general-tech-help-7/carnor21-45871/)

carnor21 02-28-2012 08:27 PM

carnor21
 
I have a '93 Accord SE and am trying to figure out what rpms should be at 70 mph... I've seen comments anywhere from 2700/rpms to 3100/rpms. It is running very hard at 3100 @ 70 mph...

My '92 ran at 2800, and my son's '95 runs 2700 @ 70... Please help clarify the most accurate mph-rpm ratio! Of course, advise is very much welcomed!
Note: everything is tuned up--engine and transmission-wise. :(

PAhonda 02-28-2012 08:54 PM

Was your 92 accord an LX, DX, or EX? How about your son's 95?

JimBlake 02-29-2012 07:10 AM

Automatic or manual have different gear ratios. Should we guess which you have?

crispin 02-29-2012 07:12 AM

I guess he has a blue car - if that helps any...

carnor21 02-29-2012 09:41 AM

Thank you for the response. My 92 was an EX & the 95 is an LX. All 3 are automatic.

One more point: the D4 light is out (and I understand it has been for a long time), so I do not know if it is blinking... Thank you again!


Thanks for the color commentary Crispin! No blues brother...

Roader 02-29-2012 12:05 PM

It shouldn't be turning 3100 rpm @ 70 mph. From "http://www.cb7tuner.com/vbb/showthread.php?t=37839" The second post lists the auto trans ratios & final drives.

USDM F22AX 90-93 ACCORD EX/SE COUPE/SEDAN:

Diff Type & Tranny Codes:
STD Only = ?

2.705 1
1.464 2
1.028 3
0.674 4
4.285 final

4th gear 195/60 R15
70mph = 2806 rpm
80mph = 3207 rpm

Does your '93 have very low profile tires and/or had a lower geared DX/LX coupe trans swapped into it?

carnor21 02-29-2012 07:01 PM

Thank you!
 
4th gear 195/60 R15
70mph = 2806 rpm
80mph = 3207 rpm

Does your '93 have very low profile tires and/or had a lower geared DX/LX coupe trans swapped into it?[/quote]



Thank you! I appreciate your feedback. I will check to see if it is a swapped tranny.

Do you know of other possible problems? I was told it is likely the Torque Converter not slipping into highway 'overdrive'.

JimBlake 03-01-2012 06:59 AM

If the torque converter doesn't lock up correctly, that should cause a flashing D4 lamp (which is burned out). Fixing that lamp might help diagnose?

carnor21 03-01-2012 10:43 AM

Thank you for the advice. I see that getting that getting the D4 light working again is going to be the only way to better diagnose the problem.

To do that, I understand that I probably have to change out the TCU unit... Is this true? If so, is it something that I can do? Are there after-market TCU units that are cheaper than dealer product?

I thank all that have shared insight!

JimBlake 03-01-2012 04:00 PM

I was thinking a burned out bulb in the cluster...

I don't know the pin-outs for the TCU, but pretty sure that bulb is powered all the time and the TCU switches the ground leg of the circuit. So if you find the right wire, you could simply use a test-lamp to get it flashing & read the code. Someone probably has a wiring drawing for 93.

A cheaper TCU would be ebay or salvage yard, or on-line discounted parts place. Never seen an actual different manufacturer.

Roader 03-01-2012 06:55 PM

X2 on replacing the burned out bulb.

The torque converter lock up is pretty noticeable. On a flat road, drive 70 mph steadily and then slowly push the gas. The tach should jump up quickly a few hundred rpm when the converter comes out of lock due to the extra load. The opposite should happen when you ease off the gas. In either case, to me it almost feels like the trans is shifting into another gear.

carnor21 03-02-2012 08:27 AM

Appreciate It!
 
:):)Jim/Roader,
You guys are awesome! I joined the forum expecting to get nowhere, but you've made the difference. The advice seems to be on-target.

So, I am trying to find out if the tranny has been changed out to a DX or LX model. I will try to get the D4 light working to see the code. On the latter, should I try to short-curcuit the D4 light at the instrument panel (I assume) or TCU?... I know the TCU unit is located on passenger-side floorboard, if I can get the electrical schematics for the 93 should I try to check there first? Sorry for all the questions!

I will also check to see if the torque converter is doing what Roader says it should shift on freeway @ 70 mph.

Again, thank you very much! If I lived nearby, I'd buy you guys all you can drink and/or eat! :)

Roader 03-02-2012 10:09 AM

Take the cluster out and put a new bulb in. It's probably a T5/74 bulb available at any auto parts store.

PAhonda 03-02-2012 06:16 PM

The quick test for the D4 bulb is to unplug the electrical connector to the TCU and ground the proper pin.

You may want to take a look at your TCU. On older Hondas, there was a sight glass with a LED that would flash the codes. They stopped having the LED by the 94 accords. Maybe the 93 still had the LED, so you can check codes that way?

carnor21 03-03-2012 08:48 AM

Yet another thank you! I will be able to have someone look at these matters early next week so I will share all the information provided by forum members.
My sense is that you have saved me a chunk of change! (Probably not enough to fly back East to treat you all to the beer and food, though. :o)


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