Help me, car is missing badly
Thread Starter
Registered User
Joined: Apr 2007
Posts: 115
Help me, car is missing badly
Another help me thread 
Background:
Car had a problem with shaking @ 45 mph once rpms settled/hesitating/very low power.
Drove like that for 6 months till mechanic fixed it. Was the distributor/cap/rotor. Power restored, Hesitation gone. Only problem was rpms were jumpy(from 500rpms to 1000rpms) which never happened before.
Drove like that for 7 days and then the tranny went out. Car only drove in reverse. Brought it back to mechanic and they fixed the tranny issue. It was a cable that needed to be fixed.
Now i have the car back. It has lost alot of low end torque again. High end power seems alright except for the bad miss. Say i'm going 50 mph and i accelerate. What happens is the car hesitates and starts shaking and does not accelerate. RPM's dont go up, i just get a shaking feel. I have to step on the gas harder to get it to pass that hessitating state to where it accelerates. Car still had the jumpy rpm issue till today when i seafoamed it. Now the idle is much smoother, not perfect but much better.
What do you think this could be? When i picked the car up a couple weeks ago, the car was making a horrible rattling sound. Mechanic told me it was the catalytic converter. I'm never going back there again so i went to my buddy who told me that it could be a bad cat but i havent had a chance to get it to him to take a look @ it and i wont for a couple of weeks.
What do you guys think? Why would it lose a little bit of power after they fix the tranny? What do these symptoms sound like? Could somethign be lose in the exhaust or cat somewhere?
Background:
Car had a problem with shaking @ 45 mph once rpms settled/hesitating/very low power.
Drove like that for 6 months till mechanic fixed it. Was the distributor/cap/rotor. Power restored, Hesitation gone. Only problem was rpms were jumpy(from 500rpms to 1000rpms) which never happened before.
Drove like that for 7 days and then the tranny went out. Car only drove in reverse. Brought it back to mechanic and they fixed the tranny issue. It was a cable that needed to be fixed.
Now i have the car back. It has lost alot of low end torque again. High end power seems alright except for the bad miss. Say i'm going 50 mph and i accelerate. What happens is the car hesitates and starts shaking and does not accelerate. RPM's dont go up, i just get a shaking feel. I have to step on the gas harder to get it to pass that hessitating state to where it accelerates. Car still had the jumpy rpm issue till today when i seafoamed it. Now the idle is much smoother, not perfect but much better.
What do you think this could be? When i picked the car up a couple weeks ago, the car was making a horrible rattling sound. Mechanic told me it was the catalytic converter. I'm never going back there again so i went to my buddy who told me that it could be a bad cat but i havent had a chance to get it to him to take a look @ it and i wont for a couple of weeks.
What do you guys think? Why would it lose a little bit of power after they fix the tranny? What do these symptoms sound like? Could somethign be lose in the exhaust or cat somewhere?
Last edited by z28rider78; Mar 9, 2008 at 07:19 PM.
Registered User
Joined: Oct 2006
Posts: 2,731
From: Post Falls, Idaho
Have you had it scanned for codes? The cat could be clogged causing issues. Read old posts and you will find a lot of info about this. My mechanic checked my in 10 minutes and didn't charge me for it.
Registered User
Joined: Aug 2007
Posts: 316
From: Purgatory... Also known as New Jersey.
If you drove it with a misfire for any amount of time you may have melted the ceramic 'brick' inside the cat. Unbolt the rear half of the exhaust system (flange after the cat) and have a look inside. If you need to, take a long stick and carefully try to 'move' the ceramic brick in there. It should look like a bunch of tiny square tubes. If it's moving around or partially melted, you found maybe one of the problems.
Thread
Thread Starter
Forum
Replies
Last Post
fpete1992
General 1967-2002 F-Body Tech
1
Dec 11, 2014 03:51 PM
sleeperZ96BT
LT1 Based Engine Tech
300
Jun 5, 2005 09:33 PM