Bucking

LJWELCH

MEMBER
1997 HYUNDAI SONATA
90,000 MILES

Bucks sometimes frequently, sometimes intermittently. Sometimes smaller bucks. Sometimes big bucks and have to pull over. Tachometer also bounces up and down with these bucks. Sometimes if car's been going along on highway. Sometimes if just start it up. There were mouse nests in there recently but 2 mechanics don't think it has anything to do with it. Have gotten tune-up and changed all filters and wires and plugs as well as changed cracked oil gasket. One mechanic tried new coils and this didn't seem to help.

5 Replies

FIXITMR

MECHANIC
9,990 POSTS

Based on speedo jumps (what about tach?) It could be a trans problem?

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Tuesday, September 6th, 2011 AT 2:03 AM

FIXITMR

MECHANIC
9,990 POSTS

Also check your MAF intake hosing for cracks leaks. You may have to massage to see them.

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Tuesday, September 6th, 2011 AT 2:21 AM

LJWELCH

MEMBER
2 POSTS

I will write these suggestions down and pass them on to someone else I get as a mechanic to look at it. I'm thinking my only option is to take it to a hyundai service department. Any other suggestions you might have on what it could be will be more than helpful to pass on to them in case they can't figure it out either.

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Wednesday, September 7th, 2011 AT 1:13 AM

FIXITMR

MECHANIC
9,990 POSTS

1 problem is bucking is usually taken to mean a violent sudden possibly rythmic********. What exactly yours is doing is hard to determine over the internet.

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Thursday, September 8th, 2011 AT 8:17 AM

FIXITMR