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Amedee
Amedee, ASE Master Tech
Category: Car
Satisfied Customers: 21826
Experience:  ASE Master Tech advanced level specialist. Wisconsin certified emissions state inspector
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2001 isuzu trooper limited 4x4,ok let me start by letting you

Resolved Question:

2001 isuzu trooper limited 4x4,ok let me start by letting you know this trooper had a new crate isuzu engine installed in 2007, so motor now has around 55,000 miles on it.
ok, it will run fine at lower speeds and normal driving.
but if you floor it all the way down and hold it , it acts like it is stalling and dont want to go, then as you back off it will start acting normal.
but when you do this the check engine light comes on
the codes are p1311 it is in there twice,then p0101,and p0300.I have had at several repair shops and they cant figure it out.
i have installed 2 new cat converters, seem to run better after that , but did not solve the problem or the codes.
the i replaced ignition module with a used one, and the mass airflow with a used one.
nothing changed .you can clear codes and they will come back after you floor it again.
I cant afford to keep throwing parts at it

Can you help ?
Submitted: 1 year ago.
Category: Car
Expert:  Amedee replied 1 year ago.

AMEDEE :

Hello and welcome to Just Answer! My name is XXXXX XXXXX I can assist you with your question.

AMEDEE :

If you clear the codes, which code comes back first?

AMEDEE :

Was the tune up parts replaced when this motor was installed?

Customer:

the p1311, and p0101, i think have been there everytime, the p0300,showed up also today

AMEDEE :

And the spark plugs?

AMEDEE :

Were new ones installed when the engine was replaced?

Customer:

that i am not sure of , i bought the car fro the original owner. i know it was a complete crate engine , as far as the other things , i can not verify

AMEDEE :

Ok.. please listen very carefully

AMEDEE :

This P1311 code is doe the diagnostic sensing module

AMEDEE :

Here is the definition for this code

AMEDEE :

P1311 ION Sensing Module Secondary Line 1 Circuit Malfunction
Possible Causes
Secondary Line 1 circuit is open or shorted to ground
Secondary Line 1 circuit is shorted to system power (B+)
ION sensing module has failed

AMEDEE :

This is for the ignition system

AMEDEE :

We have seen SEVERAL of these vehicles with this code caused by incorrect spark plugs

AMEDEE :

This is VERY important that you double and triple check this

AMEDEE :

The correct plugs for this vehicle are

AMEDEE :

Nippon Denso K16PR-P11

AMEDEE :

If the WRONG plugs are installed

AMEDEE :

replace them with the correct ones ASAP!

AMEDEE :

Hands down

AMEDEE :

Even if the engine does not run any better

AMEDEE :

This is a good STARTING point

AMEDEE :

This needs to be checked and verified good before going into a lot of other diagnostics for this code

AMEDEE :

Once this is taken care of and this code no longer appears

AMEDEE :

then we check fuel delivery under a load

AMEDEE :

One thing that I wanted to recomend that I think that might help

AMEDEE :

If my memory servs me correct

AMEDEE :

I have come across this issue before in the past

AMEDEE :

IT was switched o2 sensor connectors

AMEDEE :

The o2 sensor connectors were switched from side to side

AMEDEE :

Causing a condition simliair to this

AMEDEE :

This was on a vehicle with a motor that has been replaced

AMEDEE :

just like yours

AMEDEE :

I beleive it was the rear o2 sensor connectors

AMEDEE :

so your going to want to check that

AMEDEE :

after that is checked and if there is still an issue

AMEDEE :

we go after fuel pressure

AMEDEE :

It should be close to 45 and 55 psi under a load

AMEDEE :

VERY important. This should not be overlooked

AMEDEE :

IF this checks out good and the engine STILL bogs under a load

AMEDEE :

We watch the FRONT o2 sensor signals WHILE accelerating WITH the engine bogging down

AMEDEE :

Under full throttle

AMEDEE :

The engine NEEDS a LOT of fuel

AMEDEE :

So the o2 sensors should go rich

AMEDEE :

.8 or .9 or so under wide open throttle

AMEDEE :

If this does not happen

AMEDEE :

then we check the new mass air flow sensor signal

AMEDEE :

and wiring

AMEDEE :

Also, check the air intake snorkle from the air filter housing to the mass air flow sensor

AMEDEE :

Check for any cracks or rips as this can allow for air to enter the engine that is NOT acconted for buy this mass air flow sensor

AMEDEE :

which will not be accounted for by the computer

AMEDEE :

and cause a MAJOR lean condition under a load

AMEDEE :

This can and will cause your mass air flow sensor circuit code.

AMEDEE :

In addition,

AMEDEE :

check for any air or vacuum leaks with the engine at idle which will also throw this mass air flow sensor code that you are having

AMEDEE :

The P0300 just means the engine is running rough

AMEDEE :

well guess what

AMEDEE :

We knew that right?

AMEDEE :

We did not need the computer to tell us that the engine is misfiring when it is bogging down

AMEDEE :

So my point it

AMEDEE :

That code does not really help us

AMEDEE :

So we need to focus on the two other coes

AMEDEE :

codes

AMEDEE :

P1311 and P0101 codes

AMEDEE :

Does that make sense?

AMEDEE :

Does that help?

Customer:

wow thats a lot, but at least i know where to start

AMEDEE :

lol

AMEDEE :

Yeah.. I hope this helps!

AMEDEE :

Also, be sure to double check the timing marks

AMEDEE :

Just to be sure

AMEDEE :

Be sure that the timing belt did not jump any teeth as this can cause MAF readings and your P0300 code

AMEDEE :

Does this help?

AMEDEE :

If so, let me know

AMEDEE :

If you have more questions, that would be fine too

AMEDEE :

just let me know

Customer:

yes it helps, i will work with this , and see what i can find out

AMEDEE :

Sounds good

AMEDEE :

Are you ahppy with my answer?

AMEDEE :

happy

Customer:

yes

AMEDEE :

Ok

AMEDEE :

I will send over the rating system

AMEDEE :

You should see it now

AMEDEE :

Please dont forget to rate my answer for assisting you tonight

AMEDEE :

Have a great night!

AMEDEE :

Amedee

Amedee, ASE Master Tech
Category: Car
Satisfied Customers: 21826
Experience: ASE Master Tech advanced level specialist. Wisconsin certified emissions state inspector
Amedee and 3 other Car Specialists are ready to help you

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