what cause the tach jumps back and forth + no upshifting on WOT
so my bro has a 93 civic LX auto, i was driving it eariler and floored it for the very first time to see what the all mity 1.5 can do LOL
i notice that whenever i go pass 4K rpm the tach would jumps back and forth a lot. (sweeping througth 0 to 6K) lol , the engine sounds fine, it accelarate and everything, i could have care less but it DOES NOT UPSHIFT if you hold the pedal all the way down, it would eventrully hit revlimit and bounc back unless u let go of the gas a little and THEN it would up shift. so i am guessing the ECU is not seeing the correct rpm to control the upshifting.... could it be the dizzy ? ??? ??? (*** it drives perfectly fine until u floor it and wait for the thing to upshift***) |
Re: what cause the tach jumps back and forth + no upshifting on WOT
the upshifting is the torque converter... i dunno bout the rpm tach ----... i kno my 240 was doing that ---- when i first got it... it was in desparate need of the 5spd conversion/motor swap lol. now its happy
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Re: what cause the tach jumps back and forth + no upshifting on WOT
nar it`s not about the tork conveter. it upshift on regular thottle and locks up fine.
what i meant is it feels like the car is not seeing that i am hitting redline and did not make the tranny upshift AT redline. |
Re: what cause the tach jumps back and forth + no upshifting on WOT
Originally Posted by Donald125
nar it`s not about the tork conveter. it upshift on regular thottle and locks up fine.
what i meant is it feels like the car is not seeing that i am hitting redline and did not make the tranny upshift AT redline. |
Re: what cause the tach jumps back and forth + no upshifting on WOT
Check fluid levels in the tranny, same thing used to happen to my old CRX.
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Re: what cause the tach jumps back and forth + no upshifting on WOT
i would check the fluid (to see it it smells burnt) you could have a dirty transmission filter
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Re: what cause the tach jumps back and forth + no upshifting on WOT
uhhhh if its not seeing its hitting redline, how would the revlimiter work?
sean |
Re: what cause the tach jumps back and forth + no upshifting on WOT
tranny fluid is fine.
i don`t even know how the fuel cut would work, it`s just working but the tranny is not up shifting WHILE the tach needled is going crazy. |
Re: what cause the tach jumps back and forth + no upshifting on WOT
yea my girls da did that and it was simply just lack of tranny fluid! ???who would of thought!
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Re: what cause the tach jumps back and forth + no upshifting on WOT
if i remember your car doesnt have a stock tach right ?????
you probally bought a shitty pep boys one and it just bounces..... my .02 |
Re: what cause the tach jumps back and forth + no upshifting on WOT
Originally Posted by bitchasscracker
if i remember your car doesnt have a stock tach right ?????
you probally bought a shitty pep boys one and it just bounces..... my .02 FYI problem is sloved, the tranny works fine, but the tach itself is not, lol it the needle went crazy whenever i went pass 4K even if i rev it in neutral. as of the not-up-shifting problem, it`s actually shifting fine but it takes f-o-r-e-v-e-r to hit redline (compare to a d16z auto) i and throught it is not shifting LOL |
Re: what cause the tach jumps back and forth + no upshifting on WOT
Tach signal is synthesized output from ignitor in distributor. AT shift pays attention to rpm feed IIRC whereas the engine deduces rpm based on CYP/CKP/TDC and so engine revlimit is not fiddled. Not entirely certain of the Civic stuff, but the Accord AT control units I was remanning for a while sure did.
Either your ignitor is bad, or G101/G151 aka thermostat housing ground sucks donkey balls. Smoke it over, see if it doesn't fix the problem. |
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