1994 Mazda B4000 hesitation and surge

HWY50WOMAN

MEMBER
1994 MAZDA B4000
208,000 MILES

After whole new clutch system, truck now hesitates then surges after 25mph 45, 55 and so on, a few min after I shift, at first thought was fuel or vacuumn problem, after replacing maf/map/tps, new air filter fuel filter fuel pump fuel regulator cleaned fuel injectors etc etc, still having the same problem, did I get a bad clutch or is it now a tranny problem. Spent hours tracing fuel & electrical lines etc to see if pinched, nothing, at a stand still on this. Help and believe it or not will NOT throw any codes.

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,204 POSTS

Hello, thanks for the donation, when driving can you gently rest and barely push your foot against the clutch pedal, does the problem get worse? It could be the new clutch needs adjusting. Also check the air intake boot against the air filter and throttle bore, check for cracks in the air intake boot or poor mounting. Please get back to me. I want to get this problem fixed for you.

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Monday, October 7th, 2013 AT 2:52 PM

HWY50WOMAN

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3 POSTS

Thanks Ken, nothing found, pulling out the clutch and tranny, the problem must be there since the truck ran fine before the new clutch was installed. Will let u know.I know alot of folk think I wasted money on the new parts. Fuel pump, fuel filter etc, but all the parts I replaced were the original parts with 208,000 miles. So I dont feel $300 was wasted, they would have gone one by one eventually.

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Wednesday, October 9th, 2013 AT 9:16 AM

KEN L

MASTER CERTIFIED MECHANIC
47,204 POSTS

Sounds good, please let me know, we will get it fixed together. :-)

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Wednesday, October 9th, 2013 AT 11:44 AM

HWY50WOMAN

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3 POSTS

Well Ken, they pulled the clutch, the first mechanic just slammed it in there. So a new clutch kit was installed, however my truck still doesnt run the same. It lags and doesnt want to go up a hill unless you really give it the gas, the check engine light wont stay on long enough to catch a code on the code reader. Looks like my truck is ruined. Do you have any ideas what could have been done to my truck to make it go from a zippy quiet truck to a laggy hesitant noisy truck.I now have to drive 120 miles to another repair shop. Maybe they can find out.

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Tuesday, October 22nd, 2013 AT 7:50 AM

KEN L

MASTER CERTIFIED MECHANIC
47,204 POSTS

I think when the first guys installed the clutch they could have turned the engine over backwards which can cause the timing chain/belt to jump one tooth. Can you remove the valve cover/timing cover and confirm the timing marks are correct? An easy indication of this condition is the ignition timing would be way off also. Please let me know