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Dies while driving, unless under load and gas is pressed.

I have replaced: - fuel pump - fuel filter - catalytic (I was getting a P0420 code) - ignition coils - air filter (and etc.. regular maintenance items)

UPDATE: I have also replaced the Idle Air sensor, the MAF sensor, and sparkplugs - the cables seemed ok (pliable, no cracks, nothing amiss or damaged).

when it dies, there are no codes.. I am at a loss ... --EDIT: there are P0101 and P0404 codes, occasionally, but they do come back if cleared, though not immediately after it has the issue.

Dies while driving, unless under load and gas is pressed. I have replaced: - fuel pump - fuel filter - catalytic (I was getting a P0420 code) - ignition coils - air filter (and etc.. regular maintenance items) UPDATE: I have also replaced the Idle Air sensor, the MAF sensor, and sparkplugs - the cables seemed ok (pliable, no cracks, nothing amiss or damaged). when it dies, there are no codes.. I am at a loss ... --EDIT: there are P0101 and P0404 codes, occasionally, but they do come back if cleared, though not immediately after it has the issue.

(post is archived)

[–] [deleted] • 1 pt

Check throttle body. See if it's gunked up. If it is, Clean it

If the idle air control valve is separate from the throttle body, check resistance to see if it has any. If there is zero ohms, it's bad, which can cause random stalling.

[–] • 0 pt

This is actually next on my list - I replaced the MAF sensor already as I kept getting a code on possible sensor or air flow problems. No issues with air, so I replaced the sensor. No more code, but issue remains...

It only seems to occur when the car is in an idle state - highway speeds but letting off the throttle and coasting, the car will die. At a stop light while braking, it will die.. Etc...

My wife's boss (bless her heart, lol) mentioned spark plugs and now she's obsessed. They're probably 60K miles old, so I should probably replace while I am under the hood anyways. Any bad plugs would make engine noise but not kill the engine, right?

[–] [deleted] • 1 pt

Excessively worn plugs can definitely cause misfire issues. Potentially even air fuel ratio issues. Most vehicles have a replacement interval between 60k to 100k for spark plugs. I would definitely throw a new plugs at it if it's over.

As for the issue remaining, it sounds a lot like it's a transmission issue. Bring it to a reputable transmission shop to see if they can give you an accurate diagnosis as to what it may be. But be warned, transmission repairs are not cheap. But if you're going to go that route, make sure you go to a shop that has a warranty policy that they will honor.

[–] • 0 pt

OK So replaced plugs and it no longer seemed to have issues, and then it started up again. I was driving it and it just died - engine was off, but everything else was on and with no interupption. The only reason I knew it died was I was pressing gas and it stopped accelerating.

The only two codes I am getting are P0101 and P0404 - I have not yet replaced the EGR valve.

[–] • 1 pt

I had a Subaru with a similar problem. I know it has nothing to with your issue, but it was caused by worn electrical contacts in the accelerator pedal assembly. I spent weeks reading every user forum I could find, finally figured it out.

Your problem is likely something simple. Good luck.

[–] • 1 pt

I'll recommend, since youve gone this far. spend 25 bucks. buy a cheapo blutooth obd2 adapter, and get the app "torque pro"

since you are the one driving the car, when it happens, with no codes, you will need to be watching live data of the various sensors.

If it runs, You've ruled out the mechanical. now its electrical. you need something that can analyze sensors and so forth.

If you are without the multi thousand dollar scanners, and arent really needing to purchase something like an xtool for yourself, my option will give you 80% of the data for the cheapest price.

intermittent issues are very hard to diag. Live data when it happens, is invaluable.

I personally would start around the throttle body, tps... i dont know this model car well enough to have a real sense of what goes wrong. so general advice is the start.

[–] • 1 pt

Oh, thats a great idea. I actually have one and TorquePro as well , but never put 2 and 2 together to go driving and monitor the input as it happens. thanks! Hopefully this can lead to something more directed as I have no ideas now.