[sfmc-99CAT]

As the title says.
Owned for 2+years now. Newest issue since replacing the MAF sensor a year ago.
Got stranded 1/2mile away from home. Car died, tried to restart, engine wouldn’t hold a normal idle or continue running below 2200rpm. Car was towed home.

No Check Engine Lights before this issue, no CEL’s as it sits in my driveway now.

I’ve been through the Catera sub-forum at least once since buying the car to learn it’s known/common issues, so in addition to the MAF sensor I also bought replacement crank & camshaft sensors, both L/R coil packs, new plugs, and valve cover & plenum o-rings/gaskets in anticipation of future probable dilemmas. Car was running like a top since yesterday.

Any advice would be appreciated.

 

[globuslive]

As the title says.
Owned for 2+years now. Newest issue since replacing the MAF sensor a year ago.
Got stranded 1/2mile away from home. Car died, tried to restart, engine wouldn’t hold a normal idle or continue running below 2200rpm. Car was towed home.

No Check Engine Lights before this issue, no CEL’s as it sits in my driveway now.

I’ve been through the Catera sub-forum at least once since buying the car to learn it’s known/common issues, so in addition to the MAF sensor I also bought replacement crank & camshaft sensors, both L/R coil packs, new plugs, and valve cover & plenum o-rings/gaskets in anticipation of future probable dilemmas. Car was running like a top since yesterday.

Any advice would be appreciated.

Try to disconnect MAF sensor and start it, if it idles. With no maf, ecu would command preprogrammed setting and should run fine if that's your issue. Crank sensor usually is not affected by rpms, it's either work or not. Usually works again after cooling down, and never throws codes.

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[sfmc-99CAT]

Good call.
disconected MAF.
Allowed car to idle until idle became rough.
idle went from 1100rpm to aprox 600 over 2min…
car sent out a cel notification (p0100 & (p0110)then died.

Reading your post, am I correct to assume that the current issue is with the Crank Sensor as it does not generate a CEL notification when it becomes faulty, or will I be replacing a MAF sensor again, even though it wasn’t generating a CEL?

Thanks 👍

 

[globuslive]

Good call.
disconected MAF.
Allowed car to idle until idle became rough.
idle went from 1100rpm to aprox 600 over 2min…
car sent out a cel notification (p0100 & (p0110)then died.

Reading your post, am I correct to assume that the current issue is with the Crank Sensor as it does not generate a CEL notification when it becomes faulty, or will I be replacing a MAF sensor again, even though it wasn’t generating a CEL?

Thanks

With disconnected MAF, it has nothing to do that it dies anymore. So I won't touch MAF for now. If you have crank sensor around, I'll put it first before going any further. It might be fuel system as well, once pressure drops engine stalls, you can check It too. Not that hard, but you will need pressure gauge to hook it up to fuel rail connector, that looks like valve stem, that sits below air plenum, to see if there any pressure drops when it happens. But I'll do it next step after crank replacement, it that doesn't help. Ps. You got p0100 and p0110 because MAF being disconnected. Which means electric circuits are ok.

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[sfmc-99CAT]

Picked up a fuel pressure gauge, attached to get a reading. The system gets 40lbs psi (+/-1) consistently when cranking/idle/revs.
System pressure also remained consistent when engine/ignition was turned off.
Tested the pressure with MAF both connected & unplugged. In both reviews the fuel pressure did not drop even while the engine struggled to maintain idle & acceleration (MAF connected).

As of current: Fuel pressure system has also held steady after +30min ignition off.

In addition, I replaced the Crankshaft Sensor with a new unit, also checked both sensors (old/new) with a multimeter and both registered the same resistance.

 

[globuslive]

Picked up a fuel pressure gauge, attached to get a reading. The system gets 40lbs psi (+/-1) consistently when cranking/idle/revs.
System pressure also remained consistent when engine/ignition was turned off.
Tested the pressure with MAF both connected & unplugged. In both reviews the fuel pressure did not drop even while the engine struggled to maintain idle & acceleration (MAF connected).

As of current: Fuel pressure system has also held steady after +30min ignition off.

Have you replaced crank sensor yet? So your stalling is not fuel related.
So does it stall with MAF disconnected ?

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[sfmc-99CAT]

Yep 👍
Crank sensor replaced.
It does maintain idle with MAF unplugged.

 

[globuslive]

Yep
Crank sensor replaced.
It does maintain idle with MAF unplugged.

So change the MAF and you should be good to go. You can actually even drive it for now until replaced, nothing gonna happen

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