Bad hesitation above 5K rpms

[mystic996]

Hi all,

99 C2 72K miles w GIAC upgrade flashloaded (10/05) & Evo V-flow intake (6/05). I am going around in circles with this problem. Experiencing very bad bucking north of 5K. Back off throttle and it recovers. Finally CEL went on during this hesitatation. Dealer said code read bad MAF so they replaced ($500+ ouch!) Service manager lectured me about use of aftermarket intake and that it voids the warranty on the new MAF.

80 miles later and the problem is back. It may never have gone away but I just happened to push the car under hard accel. recently and it still has the problem. Have not pushed to the point of the CEL going on again... AWE, who did the flashload, said its not that. Todd at Evo says MAF failure in non-turbo is very rare.

I have only put 4K on since I installed the V-flow and have not yet re-oiled it so I am doughtful that this ever was a contaminated MAF....Anyone??

[1999Porsche911]

Hi all,

99 C2 72K miles w GIAC upgrade flashloaded (10/05) & Evo V-flow intake (6/05). I am going around in circles with this problem. Experiencing very bad bucking north of 5K. Back off throttle and it recovers. Finally CEL went on during this hesitatation. Dealer said code read bad MAF so they replaced ($500+ ouch!) Service manager lectured me about use of aftermarket intake and that it voids the warranty on the new MAF.

80 miles later and the problem is back. It may never have gone away but I just happened to push the car under hard accel. recently and it still has the problem. Have not pushed to the point of the CEL going on again... AWE, who did the flashload, said its not that. Todd at Evo says MAF failure in non-turbo is very rare.

I have only put 4K on since I installed the V-flow and have not yet re-oiled it so I am doughtful that this ever was a contaminated MAF....Anyone??

Get yourself a scanner to read the codes or stop by Autozone and ask them to read it. When was the last time you changed the plugs? A good scanner that can read the codes as well as all major sensor readings is a MUST for new cars. You could have invested $250 or less in a scanner and found that the problem was not the MAF and still be ahead bt $250+ thanks to another dealer ripoff.

Did the dealer give you the old MAF back? Probably not. A local dealer was caught recently putting in replaced MAF's after cleaning them and charging full price to customer.

[mystic996]

Thanks,

Plugs changed at major maint. about 15K ago. Would a bad plug read out as MAF problem?? Unfortunately, paperwork from dealer does not indicate specific P code. Any suggestion as to make and model of code scanner?

Hi all,

99 C2 72K miles w GIAC upgrade flashloaded (10/05) & Evo V-flow intake (6/05). I am going around in circles with this problem. Experiencing very bad bucking north of 5K. Back off throttle and it recovers. Finally CEL went on during this hesitatation. Dealer said code read bad MAF so they replaced ($500+ ouch!) Service manager lectured me about use of aftermarket intake and that it voids the warranty on the new MAF.

80 miles later and the problem is back. It may never have gone away but I just happened to push the car under hard accel. recently and it still has the problem. Have not pushed to the point of the CEL going on again... AWE, who did the flashload, said its not that. Todd at Evo says MAF failure in non-turbo is very rare.

I have only put 4K on since I installed the V-flow and have not yet re-oiled it so I am doughtful that this ever was a contaminated MAF....Anyone??

Get yourself a scanner to read the codes or stop by Autozone and ask them to read it. When was the last time you changed the plugs? A good scanner that can read the codes as well as all major sensor readings is a MUST for new cars. You could have invested $250 or less in a scanner and found that the problem was not the MAF and still be ahead bt $250+ thanks to another dealer ripoff.

Did the dealer give you the old MAF back? Probably not. A local dealer was caught recently putting in replaced MAF's after cleaning them and charging full price to customer.

[1999Porsche911]

There are many good scanners. If you do a search, you;ll find many recomendations. Make sure it will display the sensor readings, including )2 sensors MAF, Fule Trims, Engine Temps, calculated load, timeing, etc. Many people use the one from http://www.autoenginuity.com/

And, yes, a bad plug may show up as a rich condition on that side of the engine or a misfire. The scanner willhelp you see exactly what the engine is doing at different times, regardless of what any code may indicate.

Edited January 23, 2006 by 1999Porsche911

[Costa]

Did the dealer give you the old MAF back? Probably not. A local dealer was caught recently putting in replaced MAF's after cleaning them and charging full price to customer.

I wonder how many MAFs actually fail due to actual component failure - I gather many would just get contaminated with filter oils and the like and after some careful cleaning with some electronic type cleaning solvent etc would probably bring them magically back to life....