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  #1  
Old 06-29-2016, 01:13 PM
1997mazdab4000 1997mazdab4000 is offline
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Join Date: Jun 2016
Posts: 2
Default Engine Jerking while accelerating

I have a 1997 Mazda B4000, 5 speed, 4x4. I have no CEL on. Truck starts and runs fine and when driving easy on it youll notice no problems at all. When driving normal and accelerating at normal rates sometimes you'll feel the truck jerk forward and backward like a cylinder is misfiring randomly. It's not a consistent misfire like it's the same cylinder all the time, and it's only when there is a load on the engine. If I'm driving along just maintaining speed through town it runs smooth. but as soon as I press the gas pedal down a little more and there's more load on the motor it start bucking and jerking. if I let off of the gas pedal some, it goes away. Sometimes the problem is worse than others and sometimes is goes away completely and I can drive it any way I want and it never messes up. I used to have about 5-6 DTC's when I scanned the truck one day after buying it. I didn't know there were issues because the CEL was burned out. I went through and replaced a bunch of parts to take care of all of the codes and everything was great for a few months until this started happening.

Here's a list of the parts I've replaced:
Fuel Pump
Fuel Pressure Regulator
EGR Valve
Purge Solenoid and Thermistor
Cleaned the MAF with MAF cleaner
Engine Coolant Temp Sensor (the 2 wire sensor)
I also found a vacuum leak and fixed that
DPFE sensor
Fuel Filter
Spark Plugs
Coil Pack
and I have a new filler neck on the way to replace it since it leaks gas when I fill it up all the way.

Someone please make me look like a newb and tell me it's something simple I've missed! I also have a scan tool that will data log, if you need me to check anything else.

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bump.
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  #2  
Old 06-29-2016, 07:03 PM
1997mazdab4000 1997mazdab4000 is offline
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Default Re: Engine Jerking while accelerating

come on where are the knowledgeable guys lol
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  #3  
Old 06-30-2016, 10:30 AM
cowboybilly9mile cowboybilly9mile is offline
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Posts: 4,900
Default Re: Engine Jerking while accelerating

Quote:
Originally Posted by 1997mazdab4000 View Post
Someone please make me look like a newb and tell me it's something simple I've missed!
Today is "the now", it's not two months ago. So as always, begin with basic diagnostics......

a) A visual for obvious problems. Fix if detected.

b) Pull DTC's and use the diagnostic flow charts (in the FSM or clone of it) to identify the cause of the DTC. Cause may well NOT be a part.

*Buy no parts until you know that the part you are buying will correct the DTC(s).
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  #4  
Old 12-09-2016, 10:23 PM
nwhite5974 nwhite5974 is offline
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Default Re: Engine Jerking while accelerating

If it's moving under power it might be engine mounts


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  #5  
Old 12-10-2016, 12:08 AM
bjurke bjurke is offline
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Join Date: Jul 2011
Posts: 333
Default Re: Engine Jerking while accelerating

your problem sounds like a problem i had after a spark plug set change. in my case was a bad plug. got a different plug set and problem fixed but you never mentioned changing the spark plug wires. just a thought. good luck
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  #6  
Old 12-10-2016, 09:04 AM
Grumpa Grumpa is offline
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Join Date: Mar 2016
Posts: 226
Default Re: Engine Jerking while accelerating

Verify your firing order... make sure you have all the plug wires going to the proper spark plug. Doesn't hurt to check.. may find a defect too, like a broken plug or cracked wire. Also test your TPS with a multimeter, it may have a dead spot.
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  #7  
Old 12-10-2016, 11:11 AM
bigfisher bigfisher is offline
Mustang Owner
 
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Posts: 14,055
Default Re: Engine Jerking while accelerating

I see plugs and coil pack, but no wires changed. When you do a tune up you change plugs and wires.


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fuckin Nissan shhhiitttttttttt!!!!!!!!!!!!!!!!!!
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