When traveling at a constant speed right above 2000 rpm, I let rpm drop below 2000 rpm. When I apply the gas again I feel and hear a shudder. It does not happen all the time and nothing came up on the diagnostic test. I'm not sure what the problem is, my thoughts are the torque converter, throttle boby/valve, and line pressure solenoid. Do you have any idea, my mechanic says it needs to get worse before he can dianosis the problem.
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Re: 2000 volvo c70 shudder
I can think of a few things that may be happening.
The electronic throttle modules (ETM) are problematic. There is a software upgrade that addresses some of the issues, and replacement of the ETM may also be needed. Volvo has an extended warranty on the ETM, so this may be of no charge to you
The MAF sensor also fails and causes idle as well as acceleration issues
Volvo often comes out with software upgrades for the engine and transmission control modules that address all sorts of issues
Also, make sure that the trouble codes are checked and recorded before any work is done
Check the transmission fluid and flush the entire system if the fluid is dark or has a burnt smell
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Believe it or not, It might be the fan clutch. I fought my trans for 3 months with the same issue before I realized the fan clutch was bad. It would rapidly lock and unlock at the rpm range that the overdrive shifts at. Sometimes it felt like I was on a dirt road that was washboarded.
Check to see if the fan rotates freely 360 degrees(With engine STOPPED, of course). There should just be smooth resistance. Also check if there is any play by trying to rock the fan fore and aft. There should be no slop.
After I replaced the clutch, the trans shifted fine and even a check engine light went out.
A shuddering fan clutch will send hard vibrations through the truck and mimic a trans issue.
My apologies for the delayed response. I am going back to answer unanswered questions.
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The idle air valve (located below the throttle body) provides the control for constant idle speed. In order to set the correct air valve opening to achieve constant idle speed, the fuel injection control unit uses information from the air mass meter, throttle valve switch and the ignition control unit (RPM signal) to regulate the output current to the idle air valve. This means that the idle valve is not affected by air leaks or a jammed throttle valve.
Well there is a rev limiter built into the pcm on your car. It is much lower rpm's in park and neutral. When u hit the rev limit of a particular gear selection, the pcm starts cutting out the injectors(fuel). This is normal. As far as the jerky feeling, the only thing I know of is a service bulletin that may apply to your car. It involves a revised torque converter for the transmission. It would only apply if your feeling this at speeds of approx 35 mph or higher when the torque converter lockup engages after a shift. Ask your dealer about a possible tsb for this if you think this may sound like your problem or search for tsb's(technical service bulletin's) yourself on the internet.