Trans doesnt downshift at full throttle.

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Mar 21, 2006 | 11:55 AM

Tectron1

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From: Wanatah In,

Trans doesnt downshift at full throttle.

Under full exceleration(floored) my trans(1994 e4od) is failing to fully downshift into the lower gear. Its as if I put it in neutral and floored it. I have only noticed it once since I floor it mayby once or twice a year. But I have had codes 628 and 625 for some time now but the trans works as it should(exept for this instance) Last year I replaced the mlps and I have gone through the wiring several times and all of the external connections are good. I have suspected a tps for the other issues, Would a bad tps cause this condition?

Mar 21, 2006 | 05:51 PM

alz

Fleet Mechanic

Joined: Nov 2004

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From: Michigan

If you mean that when you floor the truck and it does not go into passing gear? That sounds like TPS. You say that when you floor it, it's as if it were in neutral. Do you mean it does not accelerate, or it revs up like not in gear?

Mar 21, 2006 | 06:14 PM

quicklook2

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Joined: May 2004

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From: Lakewood, Ohio

you have checked the level of the trans fluid after it is warm right?

last week someone was having problems and he did not check fluid properly.

have you drained trans and convertor and put in new fluid lately?

Mar 21, 2006 | 08:19 PM

vman

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Joined: Feb 2001

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From: brimfield township,OH

I know I had that problem when I ripped the wiring off my speed sensor.

Mar 23, 2006 | 10:09 AM

Tectron1

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From: Wanatah In,

I checked the fluid and it was about 1/4 pint low, I wouldnt think that would cause it to slip that bad. I dumped the converter and pan about 6 months ago when I swapped in a differant engine, and I change it regularly otherwise(plug in pan).

When I floored it it started to downshift but instead of going into passing gear it acted as if I put in neutral, When I eased up on the pedal it kicked into gear like its supposed to. It downshifts like its supposed to when I dont floor it.