Sluggish Acceleration when Cold

[dcporsche99]

Hey CJ,

...why was your car at the bodyshop?? I guess I missed that thread. Glad to hear you have 'er back.

IMHO, from what you described with the gas gauge having been below "EMPTY"....I'm thinking possibly fuel filter also. I take it you didn't get a CEL?? Or any new sounds??? Hmmm??? Hopefully, that's all it is.

(RE: Regarding poor power,..... I recently have an issue with a misfire on one of my cylinders that gave me a ticking sound (re: sticky lifter), poor power on the low end and a CEL ...I'm currently awaiting the parts for my home fix).

But, I will have to defer to the more experienced wrenches online regarding your issue...

Keep us posted!

[CJ_Boxster]

It was in the bodyshop getting repainted cause someone egged the entire car. Shes even better than before now.

UPDATE: Yesterday, i went home and pulled out the super expensive OBDII scanner my father has and decided to check realtime engine running data and right away 1 thing stuck out the most... On a nite where its 53 degrees the MAF airtemp sensor was returning a value of 113 degrees.

Then just for good measure since i didnt have any pcodes appearing, i told the scanner to show me the most recent previous pcodes triggered that arent current issues but past issues and i had "threshold rich cylindars 4-6 and 1-3" pcodes so that made it alittle more obvious that the MAF was causing the computer to dump loads of fuel into the cylinders at high RPMs because it thinks the air is so hot.

So unplugged the MAF and all the torq is back.. now to buy a new one.

[Dr. Kill]

Glad you found your problem - and that it isn't all that bad.

[Lil bastard]

I think it's time to replace the MAF. Aside from the Hot Film type Mass Air Flow Sensor, this part has the Intake Air Temperature sensor integrated into it.

You cannot fix this Intake Air Temperature sensor by cleaning the MAF. If it is wrong, all you can do is replace it.

You can test the Intake Air Temp sensor, which is really just a 'thermister' - it changes it's resistance to a constant electrical current based on temperature.

Remove the MAF and connect an Ohmmeter to pins 1 & 3. You should be seeing 2.3-2.7 kΩ @ 20°C (68°F). Any other value and the MAF must be replaced.

BTW, a high Intake Air Temp would cause the DME to lean out the fuel supply, not enrich it because Hot air is less dense than cool air. Seeing less air mass, the DME would reduce (not increase) the amount of fuel supplied.

[CJ_Boxster]

Originally Posted by Lil bastard

I think it's time to replace the MAF. Aside from the Hot Film type Mass Air Flow Sensor, this part has the Intake Air Temperature sensor integrated into it.

You cannot fix this Intake Air Temperature sensor by cleaning the MAF. If it is wrong, all you can do is replace it.

You can test the Intake Air Temp sensor, which is really just a 'thermister' - it changes it's resistance to a constant electrical current based on temperature.

Remove the MAF and connect an Ohmmeter to pins 1 & 3. You should be seeing 2.3-2.7 kΩ @ 20°C (68°F). Any other value and the MAF must be replaced.

BTW, a high Intake Air Temp would cause the DME to lean out the fuel supply, not enrich it because Hot air is less dense than cool air. Seeing less air mass, the DME would reduce (not increase) the amount of fuel supplied.

Well that makes sense. Im just glad the torq is back cause Chevron across the street is at 3.99 for super and with the MAF plugged in, the boxster was just ********************t*ng gas like a greengo after eating his first enchilada. Thanks for the data for the Ohm meter, I've wanted to check it but didnt know what values i should be looking for. Ill have to get some batteries for the Ohm meter before i can do that.

[Brucelee]

Originally Posted by CJ_Boxster

Well that makes sense. Im just glad the torq is back cause Chevron across the street is at 3.99 for super and with the MAF plugged in, the boxster was just ********************t*ng gas like a greengo after eating his first enchilada. Thanks for the data for the Ohm meter, I've wanted to check it but didnt know what values i should be looking for. Ill have to get some batteries for the Ohm meter before i can do that.

I always throw a bottle of techron on my car for issues like this. Seems to do the trick.

How are the plugs, old?

[CJ_Boxster]

well the plugs were replaced by me about 1 year in a half ago & 33k miles ago.

Whats the service interval for replacing sparkplugs?