Out of Ideas!! P0301 and P0303 codes

[jmaz001]

Hi All.

I have searched the forum for ppl with my issue but no luck. The
explanation below is a bit long winded I tried to encompass all I have
done. Thanks in advance for reading and helping.

I am at my wits end. My wife's 99 Camry
with 1MZ-FE 3.0L engine started running with very limited power while I
was driving. This happened out of the blue traveling around 45mph.
Under load I could barely accelerate. Under idle it has a deep vibration
it never had. I was running low on gas
at the time(nothing too extreme but I had a 45 min drive home). Only
put 1/4 tank in thinking it may be fuel issue and don't want to drop a tank full of gas if I have to change the pump (not sure if that is necessary or not). No change.

Got the codes read as soon as it happened....P0303-Cylinder 3 Misfie, P0441-Evaporative Emission Control System Incorrect Purge Flow, and P0446-Evaporative Emission Control System Vent Control Malfunction.

The P0446 code has been on for a while (like a year or so). I switched a
$50 solenoid by the charcoal canister in hopes it would fix the P0446
but no luck. So this is an old issue. (I don't believe it is related to
my engine issue but any ideas welcomed!)

The other 2 codes are new. I changed the plugs and wires (perhaps a
little hastily without knowing the true issue) and that didn't fix it. I
swapped coils and didnt fix. I borrowed a code reader today and read
the codes again and (after clearing the old ones first by disconnecting
the battery) received P0300, P0301, and P0303.

FSM says possible causes are....

• Ignition system
• Injector
• Fuel line pressure
• EGR
• Compression pressure
• Valve clearance not to specification
• Valve timing
• Mass air flow meter
• Engine coolant temp. sensor
• Open or short engine wire
• Connector connection
• ECM

Changed fuel filter. No Change.

Checked for vacuum leaks. Nothing. Although a vacuum leak would most likely cause a lean condition, of which I am not getting.

MAF is good.

Need to check fuel pressure. Is there a fuel pressure service port anywhere to check fuel pressure or do I have to make T-fitting?

Any way to check EGR function without hand held pressure thingy?

What the heck does Engine Coolant Temp sensor have anything to do with these codes?!

Checked to ensure valves were in time and they are. Cam shaft may have
jumped a tooth but I would think compression numbers would be a lot
lower.

Compression check numbers: psi

REAR
Cyl 1 - 190..........Cyl 3 - 193..........Cyl 5 - 195
Cyl 2 - 200..........Cyl 4 - 205..........Cyl 6 - 210
FRONT

Service manual says anything 178 or more with nothing less than 142 is
OK. Also says cylinders should have no more than a 14psi differential.
These numbers seemed good to me but checked valve timing anyways. Timing is correct!

The, newly replaced, spark plugs in 1 and 3 had a lot of black soot on them comparable to the rest.

Also the exhaust has a sporadic 'PUTT' when it is running which is not
normal condition. Like...putt putt putt....PUTT...putt putt putt....PUTT
PUTT....putt putt putt…….....

I think that is all that I have done so far. Any ideas are appreciated. I am out of them.

-Josh

[Toyota Owners Club]

Welcome to the club! Sounds like you are not having much of a fun time with the Camry :(

[jmaz001]

Yeah it has been down for a week now. I am feeling my stress level rise. It is my wife's dd (she is currently 8 mo pregnant and has doctors appt's every week, so the timing of this is just fantastic!

[jmaz001]

By the way...thanks for the completely unhelpful comment....smh

[Terry Yang]

check your injectors. any white smog from tailpipe after warm up? check HC in your coolant system if u have a HC Reader.