long start time/rough idle

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Dec 23, 2011 | 11:04 AM

WHoisu05

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From: Dallas Tx

long start time/rough idle

heres just a few things first its a 02 Z06 with 87k miles long tubes catless x and cai. exhasut mods have been on since july. heres whats going on, when i go to start the car it takes awhile for it to fire up then when it finally starts it has a realllllyyy rough idle and shakes then shuts down maybe 10 to 15 seconds into it. some times it wil run longer. if i give the car gas it will run but as soon as i let off the gas it dies. I drove it to NTB and it was sluggish and died every time i stopped at a light. they said they couldnt find what was wrong but said to check the MAF sensor and the crank sensor well i changed the MAF today and still the same. what do you guys think? HERE are the codes its throwing PCM P0101hc, 0102h, p0300c, p1514. i'm thinking either fuel pump although i hear it prime so not sure, fuel filter, or crankshaft position sensor.

Dec 23, 2011 | 11:24 AM

87SAM

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From: Boise ID

Did this start out of the blue, or after some work was done on the car? Your DTC’s still point to the MAF. Check for air leaks between the MAF & TB and or vacuum leaks.

Dec 23, 2011 | 12:27 PM

corvettezman

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From: Home of the VOLS ! Knoxville, TN. Tennessee

St. Jude Donor '11-'12-'13, '15, '16-'17-'18-'19

Sounds like a vacuum leak. you can have your vacuum lines smoke tested.

Dec 23, 2011 | 04:03 PM

m6 c5

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Joined: Jun 2010

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From: Yorktown Virginia

Quote:

Originally Posted by corvettezman

Sounds like a vacuum leak. you can have your vacuum lines smoke tested.

I would check the line on the passenger side of the intake manifold as Ive seen that crack a few times.

Dec 23, 2011 | 04:09 PM

robert miller

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From: cookeville tennessee

Quote:

Originally Posted by corvettezman

Sounds like a vacuum leak. you can have your vacuum lines smoke tested.

What he said for sure.... Robert

Dec 23, 2011 | 04:25 PM

WHoisu05

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From: Dallas Tx

Quote:

Originally Posted by 87SAM

Did this start out of the blue, or after some work was done on the car? Your DTC’s still point to the MAF. Check for air leaks between the MAF & TB and or vacuum leaks.

thanks i'll check that out. i put headers in last july and it has been fine i just parked it went into kholes came back out 30 mins later it started up heard a poof type backfire then it started having these issues

Dec 23, 2011 | 04:30 PM

WHoisu05

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From: Dallas Tx

i think there is a leak beacuse when i drive it i hear a tick. what about a broken spring? if that broke wouldnt it drop a valve and i wouldnt be able to drive it at all?

Dec 24, 2011 | 12:16 AM

m6 c5

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From: Yorktown Virginia

Quote:

Originally Posted by WHoisu05

i think there is a leak beacuse when i drive it i hear a tick. what about a broken spring? if that broke wouldnt it drop a valve and i wouldnt be able to drive it at all?

Not all the time, if you think it is a spring then pull the covers and dont drive it anymore untill you verify the springs are ok.

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Dec 24, 2011 | 12:29 AM

El original

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From: Edmonton Alberta, Canada

How is your air filter? How about throwing in a can of sea foam? If basic maintenance is lacking, well then it could be anything, we really dont know. Good luck.

Dec 29, 2011 | 12:02 AM

#10

WHoisu05

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From: Dallas Tx

it ended up being a broke spring on the driver side

Dec 29, 2011 | 12:23 AM

#11

m6 c5

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From: Yorktown Virginia

Quote:

Originally Posted by WHoisu05

it ended up being a broke spring on the driver side

Was it still holding the valve up and out of the cylinder?

Dec 29, 2011 | 12:41 AM

#12

WHoisu05

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From: Dallas Tx

Quote:

Originally Posted by m6 c5

Was it still holding the valve up and out of the cylinder?

Yea the valve is still up with the retainer still on. The valve is low so it might be bent but if that's the worse that happened ill count myself lucky

Dec 29, 2011 | 10:33 AM

#13

m6 c5

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From: Yorktown Virginia

Quote:

Originally Posted by WHoisu05

Yea the valve is still up with the retainer still on. The valve is low so it might be bent but if that's the worse that happened ill count myself lucky

Well hopefully it stayed up and out of the way.

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