93 ATX Codes

[javve]

I have a friend who got a code reader (better than the Oreilly ones that wal mart carries for 100)....

I was finally able to get clear readings of my codes. My idle is poor, accelleration is poor, fuel milage ... what's that!!!

Here are my codes:

176
HEGO sensor indicates system lean (LH)
I am thinking just replace both O2 sensors. I see there are two upstream sensors and no downstream sensors.

215
Coil 1 primary circuit failure.
I am at a loss for what would cause this code. Sometimes the car snaps out of the slow accelleration and gets its familiar put you in your seat movement.

335
DPFE sensor voltage higher or lower than expected.
I plan to replace the sensor. I have new rubber on the intake manifold, did that when I replaced the camshaft seals, Timing belt, drive belt, and put new intake manifold gaskets on. Replaced the EGR gasket as well.

No More Oil Leaks :woo-hoo:

336
Exhaust backpressure high / PFE circuit voltage high.
I have no clue on this one. Hey I'll be honest. I do not like BS'ers and not about to be a hypocrit!!

I notice there is an Air Charge Temperature Sensor I seen on shosource that can cause some of the same symptoms I am getting. Thinking with the DPFE sensor and O2 sensors, I may as well change that as well beings it is a low cost part.

Input is greatly appreciated and needed before I get something first to find it didn't work THEN come in here and ask. Figured I would skip that step and come right here.

oh and... :thankyou:

 

[rubydist]

your plan to change 02 sensors is a good one. that should take care of the lean code.

the coil 1 failure code is more likely a dis issue than a coil pack issue in my experience - I would change the dis. be sure to use heat sink paste and tighten it properly so its grounded right.

the dpfe codes are likely due to the sensor lines being plugged. remove the egr line that runs from the exhaust manifold to the intake manifold and clean the small metal lines carefully. note that while this code will cause a cel, it will not cause your engine to run poorly in my experience.

 

[javve]

Thanks for the input. I already got a DPFE Sensor before reading this even though I had posted I was getting info before shopping!! Guess I got a little ambitious. I will check all the lines to make sure none are glogged. The only metal tube I have is the one connecting the EGR to the exaust, the others going to the sensor are vacuum lines. I have checked those for a good seal as well.

DIS could be what is causing my idle problem too. It likes to idle between 4 and 500 rpm, and some days will idle to the point of dying until I go about a block then stop.

 

[thundersho]

DIS causes the car to smoke, lose acceleration, loss of power chug. Feels like its not getting fuel and sparkit will idle funny too. Idling issues could be your throttle position sensor, a loose vacuum or a sticky idle control valve. I just went through all this myself and it was actually a piece of rubber like material blocking the fuel pressure regulator opening. Funny thing about it is was still throwing codes for tps and iac till I removed the debris.

 

[rubydist]

I will check all the lines to make sure none are glogged. The only metal tube I have is the one connecting the EGR to the exaust, the others going to the sensor are vacuum lines. I have checked those for a good seal as well.

On the side of that egr tube that runs from the exhaust manifold to the egr valve, there are 2 small tubes that connect to the dpfe box. those small tubes are typically the ones that get clogged up so the sensor will not detect the egr opening.

 

[msteiny]

Clean your mass airflow sensor (MAF) then do an idle reset. This is usually the first step in fixing a crappy idle. If this does not fix it or make it better check your idle air control valve (IAC). You can either clean it or replace it. Hope this helps.

 

[Eric VerValin]

If your worried about that dpfe.... you'll need to look at cleaning out where they end up behind the throttle body. Search for 'cleaning the snouts' or something along those lines.

 

[javve]

Thanks for all the replies. I changed the DPFE, O2 Sensors, Air charge sensor, and air filter. It is back to running like a SHO should. I probably got lucky that the metal tubes were not clogged. I also added a missing hose clamp to one of the hoses that connects to the DPFE.

I am getting no more codes either, so will clear out the stored and give it some time. I know it will take about 100 miles for the computer to recalibrate everything. So far though

:thankyou: