RPM Problem

H

Hatem

Greenie N00B Member
Hello
i am tracking a problem in my CX 7 Automatic translation since my turbo blow up , for a year searching all possible way to solve my issue , before changing my turbo everything was fine ,
was :
800 rpm -> press accelerator ->2500 rpm -> release accelerator ->1000 rpm ( Idle )
now There are two cases
*800 rpm -> press accelerator ->2500 rpm -> release accelerator ->2000 rpm ->drop slow-> 1500 rpm
*800 rpm -> press accelerator ->2500 rpm -> release accelerator ->2000 rpm ->aggressive pedal pressing -> 3000 rpm -> release accelerator -> immediate drop to1500RPM ->
i feel load in the engine and gearbox now doesn't feel comfortable while driving sometime I shift to (N) to make the engine Chilling
i checked EVAP - Actuator - IMRC - Solenoid Valve - Vacuum leak
i am really frustrating of this i hope i can find a help from anyone
 
Hi still trying to figure out this problem its annoying issue for me
since long time i am tracking an issue with my cx7 2nd generation 2.3l turbo - automatic transmission
current problem is when i drop of throttle it stay on the gear with no up shifting , the feeling as engine brake has engage , what it should be ( after few second the rpm drop on same time upshifting for saving gas )
example
i am driving in 5th gear with steady drive , i drop gas it will stay on same gear 5 and rpm drop slowly as feel like engine brake until rpm reaching 1500 sometime to 1200 then it will gear up to 6 with idle speed

before it was like this
let off throttle and after few seconds rpm drop to idle and car engine getting comfort , was nice when I drive at high way or down hill drive , now i feel its too much pressure on the engine
 
Raider said:
Have you checked fluid levels? It almost sounds like the transmission s going out.
Click to expand...


sorry for late replay , I was investigating more to try to solve and bring accurate information to find the proper solution or understanding


i can write again the problem


as I mentioned in the first post , I have changed the turbo and before that everything was as perfect

now there is many observation

first was the RPM issue and engine braking was engage whenever i let the accelerate pedal off , as per workshop manual which say If the accelerator pedal is depressed continuously for a specified time, the engine speed may decrease to the idle speed

That’s not happening with me


After driving by this way for two year now there is more issue appeared, vibration on speed 70 - 80 KM while costing and it stay vibrate if i kept pedal pressed on same pressure, the only way to goes ( press the pedal more or let off the pedal or shift to manual tiptronic gear


the problem of RPM and engine braking feel is still exist on manual drive but notice when i shift manual up it will go to idle speed


if i drive manual i have zero vibration whole day


moreover i went to check the drive shaft i found the drive shaft mount ( Rear Propshaft Mount is not in the center ) not loss so i cant move it by hand but as per observation is not in in middle , the space from top is more than bottom ( photo attached )


note i have changed the transmission fluid oil still the problem , dont feel anything wrong when shifting up from 1 to 6 or shifting down and no gear kick

there is something happen while changing the turbo at first time but cant reach to it
I have obd with live data if there is anything i can do to check
 

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Raider said:
Have you checked fluid levels? It almost sounds like the transmission s going out.
Click to expand...

Hi raider i need more help
while diagnosing my issue , i found something don't know if its normal

it may related to my first post

when i drop throttle i watched the rail fuel pressure target and actual , i found the target and actual during dropping off throttle doesnt match , its ok while my feet on gas but when i let it go off the target will drop to 430 psi but actual stay up 800 +/- depending on speed
at this time rpm will stay up , i stay off throttle until pressure go lower until it get match with the target fuel pressure , exact on that time the rpm will drop to idle speed normally
so what part and what could the reason that the fuel doesn't response to drop of gas
 
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