Question about 1994 Mazda 2WD B Series Pickup

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Had new fuel filter replaced when oil was being changed. Ever sense truck funs rough, misfires, couldn't go past 40mph. Turned it off, wait 15-20 seconds and then it runs great, smooth...Any ideas

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Sounds like timing going out get your timing checked

Posted on May 02, 2010

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What am I doing wrong? Cylinder 2 misfire will not go away. Tried everything. Even stumped a mechanic.


have a compression test done and look for a moving valve seat insert
it gives the knock, misfire
as it is no 2 cylinder it is mechanical because you have moved the injectors and coils , plugs and leads and it stays at no 2 cylinder
If you want clean engine oil then change the synthetic oil out and put in diesel oil 20w40
It will not harm the engine as it is the same as petrol oil but with more additives than petrol oil
it is cheaper and has heavy detergent properties that keeps the engine internals clean
from the gunk in the sump ,it is clear that changing engine oil on a regular basis is something you don't do but if you want a reliable long lasting engine , it is must do number 1

Oct 22, 2015 | Cars & Trucks

1 Answer

1997 buick lesabre- scan codes p300,p420,p1870,p1641. new plugs,wires,oil,filter,throttle blade cleaned,maf sensor,tps changed. now no acceleration with rough idle. could it be iac valve?


How about a blocked exhaust converter

They only last 12 to 14 years, under perfect
fuel trim conditions, with no misfires & you have
those or did

You changed the fuel filter & checked pressure at the motor?

IAC-Idle air control--so no--idle control is not your problem

Oct 07, 2014 | Cars & Trucks

2 Answers

1994 nissan runs rough when you take off.


You probably can't but if it's running rough on acceleration under load, the first suspect is a dirty fuel filter.

Jun 23, 2014 | 1996 Oldsmobile Cutlass Supreme Coupe

1 Answer

Runs rough dies


change the fuel filter and check the fuel pressure

May 25, 2013 | Ford Expedition Cars & Trucks

1 Answer

1996 Dodge neon SOHC. Car has 33k. Its my grandmothers who rarely drove it obviously. Well lately I have been getting a CEL and when ran says the #1 cylinder is lean and is misfiring. I am going to replace...


No it doesn't
If the injectors all click, move on

Start with the codes you have
Give them to us

Clean MAF Sensor
Install new O2 Sensors --if 15 years old
New Spark Plugs

I wouldn't think the exhaust converter is doing
much after 15 years

Mar 30, 2011 | 1996 Dodge Neon

1 Answer

Have a 2003 jeep liberty, 3.7L 6 cyl, had a misfire on spark plug #2 , replaced it, no codes appear, says passed. But still seem to sense a misfire, runs like there is a misfire, and when first starting...


Hello, sounds like you should get a compression test for the bank with number 2 cylinder. I am going by your statement about the Antifreeze smell. You could also do a fuel quality check and replace the fuel filter while doing this. Put the fuel in a glass jar and wait a day if necessary to see if the fuel separates. Bad fuel would also account for a rough idle and the smell.

The newer fuels we have today can separate and also attract water from the atmosphere. The Evap may have been a sign that the system was open to the atmosphere. Before doing major motor work, you may want to "smoke test" the Evap system. This requires a special machine some shops have.

I am curious to the condition of the old number 2 plug and if it looked corroded from the antifreeze. An alternative would be to remove the sparkplugs and crank the engine when it is cold from sitting overnight. Then observe if antifreeze or water was blown out the sparkplug holes.

I hope my solution is very helpful to you.

Mar 26, 2011 | 2003 Jeep Liberty

1 Answer

Rough Idle on 1986 GMC Jimmy.


change your some sensors that can probably cause your engine to run rough, ask you local oarts store for more info...

Aug 21, 2009 | 1986 GMC Jimmy

1 Answer

1991 sentra 2dr 1.6 L rough idle in park and in drive at stop


Sounds like misfire. Change spark plugs, wires, cap, rotor , fuel and air filters. Check for oil in spark plug holes. if oil found change valve cover gasket spark plug orings. they can leak oil into spark plug holes and cause misfire.

Joe ASE Master Tech

Mar 02, 2009 | 1991 Nissan Sentra 2 Door

1 Answer

Won't go past 20


My 92 Honda Accord LX was having the same problem, after replacing the the fuel filter, spark plugs, wires and distributor cap and rotor. My engine light was on and I had the car computer read to determine what was exactly wrong, the reading was 100% accurate and I changed the part that was needed myself and the car has been performing past 40mph.

Feb 16, 2009 | 1992 Honda Accord

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