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Old 06-12-2009, 04:07 PM   #1
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Default Parts to Diagnose P0300 - 97 miata

I've replaced:
Fuel Filter
Plug Wires
Plugs
Cam angle sensor
Coil pack
Checked with brake cleaner for manifold leaks

Throws a code P0300 - Random Misfire
Only goes off at High RPM/High Speed

I'd like another Fuel Pressure Regulator seems like the logical next thing on the list...

Or I'd like ideas to what the hell else it could be
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Old 06-13-2009, 05:24 AM   #2
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wow way wrong thread man........
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Old 06-13-2009, 12:29 PM   #3
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Did you check the crank sensor? That one is responsible for detecting mis fires.
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Old 06-13-2009, 12:41 PM   #4
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Sam01 - ok... i'm a n00b...

The Cam angle sensor (the one to adjust timming) is new

Where is the crank sensor? How do I "check" it
-----------------------------------------------------

Hellfire, thanks for the heads up! ***...
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Old 06-13-2009, 01:21 PM   #5
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Yes, the crank sensor is the one to look at. It is the one in the front of the engine. It is a small black sensor that sits next to the front pulley.

Basic question, is the engine running smooth? No miss fires or rough running?

Is the front pulley wobbling? That will affect the CKP (crank angle sensor) readings.
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Old 06-14-2009, 01:04 AM   #6
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Engine runs super smooth, I've checked the crank pully, no wobble to be seen

I'll take a look for the sensor...anything in particular I should be looking for? other then that its there... ?
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Old 06-14-2009, 12:30 PM   #7
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Quote:
Originally Posted by Preluding View Post
Engine runs super smooth, I've checked the crank pully, no wobble to be seen

I'll take a look for the sensor...anything in particular I should be looking for? other then that its there... ?
Take out and clean it, and inspect it. Maybe its damaged.

I think my friend had a similar unexplained misfire issue just like you and it was his crank sensor. Ill ask him to be certain what it was he changed to fix his mis fire.
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Old 06-15-2009, 09:23 AM   #8
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I'll do that then! that'd be great if thats all it was
(I'll also feel like an idiot for not asking before)

The car does have a hesitation when accelerating until you get into the higher RPMs, especially when cold, I'm not sure if that is related or not though
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Old 06-15-2009, 10:01 AM   #9
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Quote:
Originally Posted by Preluding View Post
I'll do that then! that'd be great if thats all it was
(I'll also feel like an idiot for not asking before)

The car does have a hesitation when accelerating until you get into the higher RPMs, especially when cold, I'm not sure if that is related or not though
Earlier, you said the car runs smooth...now you are saying that it has a hesitation. Which is it?

If the car has a hesitation, the problem is most likely elsewhere.
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Old 06-15-2009, 05:51 PM   #10
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****... ok...car idles smooth...very very smooth...

when it throws the code...the car is accelerating perfecting...yet the light on the dash in blinking its little heart out...then goes steady. (usually RPMs are higher then 5000rpm)

when it hesitates... thats between 2000-3500rpm just a little hiccup...worse when cold, almost not noticable when warm.
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Old 06-15-2009, 06:07 PM   #11
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The crank angle sensor has to be a certain gap on the wheel on the pulley. I don't remember exactly but like .050" or so. Also crud built up on it can cause issues. It's out in the weather.
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Old 06-15-2009, 06:08 PM   #12
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ok...just crawled under the car again...
cleaned crank sensor as best I could with my roommates toothbrush.

Also started the car... so ya...the crank pulley wobbles...
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Old 06-15-2009, 06:10 PM   #13
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Quote:
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The crank angle sensor has to be a certain gap on the wheel on the pulley. I don't remember exactly but like .050" or so. Also crud built up on it can cause issues. It's out in the weather.
Quick reply, thanks!
there was a little dirt on it...but not much...

although...my last post...the crank pulley wobbles about 3-4mm in an up down motion....so that would affect the distance for sure....

In the high revs...would it wobble more, therefore throwing off a code?
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Old 06-15-2009, 06:12 PM   #14
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I'm pissed off...going for a 2 hour drive to see if I can make use of my CAA
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Old 06-15-2009, 06:14 PM   #15
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Quote:
Originally Posted by Preluding View Post
Quick reply, thanks!
there was a little dirt on it...but not much...

although...my last post...the crank pulley wobbles about 3-4mm in an up down motion....so that would affect the distance for sure....

In the high revs...would it wobble more, therefore throwing off a code?
3-4mm? That's a bunch. That wobble should be the problem. Gap is likely inconsistent and it doesn't know where it is at times.
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Old 06-15-2009, 10:46 PM   #16
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perfect... I just came back from cruising around for a few hours trying to get the light to flip on.... It didn't turn on until I was WOT doing 120mph (closed course)

Starting my search for an escort gt motor....
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Old 06-16-2009, 12:02 PM   #17
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You can fix a the crank pulley wobble with loctite if you are so inclined. Searce for the loctite fix on m.net for the 1.6 cars. Same thing applies here. Less work than an engine swap.

On the other hand, escort swap is a great opportunity to do a coolant reroute.
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Old 06-16-2009, 12:29 PM   #18
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I've done a fix like that on my old 1990...(I used JB Weld, worked great) the pulley still wobbled though...but no codes (I love OBD1)

The pulley doesn't seem to wobble side to side(front to back) like my last one in this case, but rather up and down. I think I'll try to get a new pulley and fix it...when I do the timming belt. in the not so near future...
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Old 06-21-2009, 02:14 PM   #19
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alright... well... I've had it... the car smokes more then a baby chewing on an extension cord anyway... so in the next few weeks, its going to be time for a new motor.

Trying to find a list of cars that came with a BP motor...but I'm having a hard time...in searching...I've found the following:
91-95 Ford Escort GT
Not sure what year or trim model Proteges
Kia Sephia

Is there anywhere else I should be looking for one? I really didn't want to start a new thread call "what cars come with a BP?"
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Old 06-22-2009, 02:49 PM   #20
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Thanks wikipedia... googled a few times..just didn't put in the right search terms for a while

Quote:
The 1.8 L (1839 cc, 112 cu in) BP is a dual-overhead variant of the B8. It was first found in the 1989 Mazda Familia and American-market 1990 Mazda Protege LX. This engine was dubbed BP-ZE and featured a forged crankshaft, piston oil squirters, an aluminum baffled oil pan, and Variable Inertia Charging System (VICS). This particular variant can be found in the following vehicles:

1989-1994 Mazda Familia GT (European & Australian Market)
1989-1994 Ford Laser TX3 (Australian Market)
1990-1994 Mazda Protege LX (with VICS)
1990-1991 and 1993 Mazda Protege GT (Canadian Market)
1990-1993 Mazda 323 (European Market)
1992-1993 Ford Escort LX-E
1991-1996 Ford Escort GT
1991-1996 Mercury Tracer LTS
1994-1997 Kia Sephia GS
1997 Kia Sephia RS
1994-1998 Mazda Familia (Japanese Market)
1994-1997 Mazda MX-5/Miata (this did not have VICS until 1999)
There is also a non-performance version that is most easily recognized by its black stamped-steel oil pan. It also features a cast crankshaft, no oil squirters, a plastic oil pickup tube and less aggressive camshafts. It is found in the 1995-1998 Mazda Protege ES.


[edit] BPT
The BPT is a turbocharged and intercooled variant of the BP. It produced 179 hp (134 kW) and 174 ftlbf (237 Nm) of torque.

The most powerful version was named the BPD. It is commonly known as the 'big turbo' variant as it utilised a much larger IHI RHF6CB turbocharger. The BPT was used as the basis for the engine, with changes such as sodium filled exhaust valves, larger (and front mounted) intercooler, bigger fuel injectors and stronger engine internals helping to up the performance of the engine to produce 206 hp (154 kW) and 184 ftlbf (250 Nm).The VICS system of the N/A BP has been removed. This engine was designed to power Mazda to a world rally championship win, and was thus used in the limited production Mazda Familia GT-R (2200 built) and GTAe (300 built).


Mazda BPT - Turbocharged 1.8LApplications:

1989-1994 Mazda Familia GT-X (Japan)
1992-1993 (BPD) Mazda Familia GT-R / GTAe (Japan)
1989-1994 Ford Laser TX3 turbo (Australia)
Ford Laser GT-X

[edit] BP-4W
The 1999 Miata uses a modified BP, the BP-4W, which replaces the old Hall Effect dual Cam Angle Sensor unit mounted at the back of the exhaust cam with two separate Hall Effect units at the front - one on the intake cam gear and one mounted on the oil pump, to the side of the crankshaft pulley. It also has an improved intake system (a better flowing engine head because of the angle of the intake ports being changed). The United States 2004-2005 Mazdaspeed MX-5 turbo is based on this engine rather than the newer BP-Z3 and produces 178 hp (133 kW) and 166 ftlbf (225 Nm) with slightly-reduced compression. The Mazdaspeed turbo engine has no VICS, but does have VTCS which is often considered related, but is not.

Applications:

1998-2000 Mazda MX-5/Miata
2004-2005 Mazdaspeed MX-5 (turbo)

[edit] BP-Z3
In 2001, Mazda introduced the BP-Z3 (also called BP-VE) variant of the BP engine with S-VT variable valve timing on the intake side, no more VICS, but there is Variable Tumble Control System (VTCS)in the BP-Z3. A similar looking but effectively very different set of valves that restrict the intake on cold start for emissions purposes, rather than the torque enhancing set of partial butterflies that increase velocity that are used in VICS. This was found in the 2001+ Miata. The Z family is an evolution of this engine.

In Australia, a turbocharged version of this engine produced 210 hp (157 kW) and 206 ftlbf (280 Nm) in the Mazda MX-5 SP. The United States 2004-2005 Mazdaspeed MX-5 turbo is a BP-4W, not a BP-Z3.

Applications:

2001-2005 Mazda MX-5/Miata
Mazda MX-5 SP (Australian turbo)
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