• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' and react to posts.

Sudden No Start

NATE1987

New Member
Joined
Jan 4, 2020
Messages
10
Reaction score
3
Points
3
Location
Toronto
Vehicle Year
1994
Make / Model
Mazda B3000
Transmission
Manual
Hey,

First post here so forgive me if i miss something.

I own a 1994 Mazda b3000 se standard.

Had a misfire for the past few weeks (not super consistent). Feel like it began shortly after i changed my Air filter. Couple times it stalled due to the misfire. Have recently done an oil / filter change, and fuel filter.

Decided to see what was going on. Disconnected the hose leading from the MAF to the throttle. Also checked the sparkplugs (noticed it was running rich due to dry black fluff on the end of the spark plugs). Loaded up on a some parts to try and help correct the issue (didnt install yet) because when i went to start the truck again it would crank and not start.

Checked the usual. Has spark, compression, and fuel. 5 of the 6 cylinders in the 120psi range. one is between 90 and 100. battery is fully charged.

Not sure where i should head next on this thing.

Any tips?
 


Josh B

Well-Known Member
TRS 20th Anniversary
Joined
Aug 15, 2019
Messages
1,359
Reaction score
392
Points
83
Location
Oklahoma
Vehicle Year
1993
Make / Model
Ford Ranger
Engine Type
4.0 V6
Transmission
Manual
2WD / 4WD
4WD
Hello Nate, welcome to TRS
I'm sure you'll get plenty in the not too distant future.
Did that motor have a distributor or a coil pack?
Good luck with it man
 

NATE1987

New Member
Joined
Jan 4, 2020
Messages
10
Reaction score
3
Points
3
Location
Toronto
Vehicle Year
1994
Make / Model
Mazda B3000
Transmission
Manual
Has a distributor.
 

Josh B

Well-Known Member
TRS 20th Anniversary
Joined
Aug 15, 2019
Messages
1,359
Reaction score
392
Points
83
Location
Oklahoma
Vehicle Year
1993
Make / Model
Ford Ranger
Engine Type
4.0 V6
Transmission
Manual
2WD / 4WD
4WD
Has the check engine light come on at all ?
Have you double/triple checked the vacuum lines and such?
 

RonD

Well-Known Member
Joined
Jun 2, 2012
Messages
22,349
Reaction score
5,548
Points
113
Location
canada
Vehicle Year
1994
Make / Model
Ford
Transmission
Manual
Welcome to TRS :)

Your compression gauge is off, expected on 1994 3.0l would be 155-165psi

Was the spark plug on the LOW cylinder different than the others?


You will have a Fuel Pressure Regulator(FPR) on the engine's Return fuel line
It has a vacuum hose attached, check that hose for gasoline, if found replace FPR, this would cause Rich runing

Old O2 sensors can also cause Rich running, when they get older they "tell" computer engine is running Lean, so the False Lean causes Rich running.
O2s should be changed every 100k miles
 

NATE1987

New Member
Joined
Jan 4, 2020
Messages
10
Reaction score
3
Points
3
Location
Toronto
Vehicle Year
1994
Make / Model
Mazda B3000
Transmission
Manual
Has the check engine light come on at all ?
Have you double/triple checked the vacuum lines and such?
Hey there. No check engine light at all. Will go over the vacuum lines again. Thanks
 

NATE1987

New Member
Joined
Jan 4, 2020
Messages
10
Reaction score
3
Points
3
Location
Toronto
Vehicle Year
1994
Make / Model
Mazda B3000
Transmission
Manual
Welcome to TRS :)

Your compression gauge is off, expected on 1994 3.0l would be 155-165psi

Was the spark plug on the LOW cylinder different than the others?


You will have a Fuel Pressure Regulator(FPR) on the engine's Return fuel line
It has a vacuum hose attached, check that hose for gasoline, if found replace FPR, this would cause Rich runing

Old O2 sensors can also cause Rich running, when they get older they "tell" computer engine is running Lean, so the False Lean causes Rich running.
O2s should be changed every 100k miles
I did the compression test on a very cold engine which I feel might contribute to the low reading.

Spark plug in the low cylinder was the same as the rest. From what I’ve read doesn’t seem low enough to cause a non-start.

I guess I’ll start at the air filter and check connection to the throttle since that’s the only change recently.
 

NATE1987

New Member
Joined
Jan 4, 2020
Messages
10
Reaction score
3
Points
3
Location
Toronto
Vehicle Year
1994
Make / Model
Mazda B3000
Transmission
Manual
Turned out to be a corroded rotor and distributor cap. Running like a top now.

thanks for the input
 

Josh B

Well-Known Member
TRS 20th Anniversary
Joined
Aug 15, 2019
Messages
1,359
Reaction score
392
Points
83
Location
Oklahoma
Vehicle Year
1993
Make / Model
Ford Ranger
Engine Type
4.0 V6
Transmission
Manual
2WD / 4WD
4WD
haha, that's good news, it's also the first place to look when there's a miss with a distributor ;)

Sorry, but it's been awhile since I've had one :)
 

alwaysFlOoReD

Forum Staff Member
Forum Moderator
TRS Banner 2012-2015
TRS 20th Anniversary
Joined
Apr 13, 2009
Messages
12,286
Reaction score
3,278
Points
113
Location
Calgary, Canada
Vehicle Year
'91, '80, '06
Make / Model
Ford, GMC,Dodge
Engine Size
4.0,4.0,5.7
Transmission
Manual
2WD / 4WD
4WD
Turned out to be a corroded rotor and distributor cap. Running like a top now.

thanks for the input
Thanks for the update.
 

Sponsored Ad


Sponsored Ad

Top