what causes code PO734

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what causes code PO734

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what causes code PO734 - 5/22/2008 5:43:53 PM

underpsi

Posts: 17
Joined: 1/14/2007
Status: offline I had my buddy run the check engine light codes and this was one of them along w/ all 4 O2 sensors. it is PO734 Incorrect Gear Ratio (4)????? it runs fine and shifts fine so have no idea what would cause this...

Thanks
David

Post #: 1

RE: what causes code PO734 - 5/22/2008 5:57:04 PM

Disco2Guy

Posts: 922
Joined: 9/12/2007
From: San Francisco, CA.
Status: offline I had that with 2 other codes (don't remember the numbers off hand) but they were "bank 1 too lean" and "bank 2 too lean". Had to replace the MAF on my D2. When I was telling my mechanic about the codes it wasn't until I told him about the Gear 4 Ratio code that he knew I needed a new MAF. It might be something different for you though.

_____________________________

-D2G
NCLR Club #70
vids
pics

"RovrFlo"
''''''''''''''''01 Disco 2 w/ ''''''''''''''''04 CDL
2" RTE/OME, RTE sliders, OME stabilizer, BFG 2

(in reply to underpsi)

Post #: 2

RE: what causes code PO734 - 5/22/2008 6:42:20 PM

jkid

Posts: 649
Joined: 9/26/2007
Status: offline Most likely an air metering problem. Check for vacuum leaks too. I had that code off and on for months, eventually it came on all the time along with those 2 lean codes and a 3rd gear ratio code as well. Well, I think I finally found the problem and it wasn't the MAF like I thought. There is a plastic nipple that threads into the passenger side of the intake with a hose attached running to the valve cover which had loosened up. I put some teflon thread tape on there and I've been code free for almost a week. Damn thing better not come back.

_____________________________

01 D2 SE (90K miles) Stock For now
1982 Mercedes 300SD (270k miles)

(in reply to Disco2Guy)

Post #: 3

RE: what causes code PO734 - 5/28/2008 12:13:40 AM

scubaman

Posts: 9
Joined: 5/28/2008
Status: offline Hi jkid,

Will you be able to post a photo of the plastic nipple? I am not sure where to look.

Thanks in advance!

_____________________________

2000 DII

(in reply to jkid)

Post #: 4

RE: what causes code PO734 - 5/28/2008 5:31:08 AM

Disco Mike

Posts: 11153
Joined: 4/27/2006
Status: offline

quote:

ORIGINAL: underpsi

I had my buddy run the check engine light codes and this was one of them along w/ all 4 O2 sensors. it is PO734 Incorrect Gear Ratio (4)????? it runs fine and shifts fine so have no idea what would cause this...

Thanks
David

Give us all the exact codes along with the mileage on your truck.

_____________________________

Mike
Retired service manager. Member of the Solihull Society, NCLR club,past member of the SCLR club and Santa Barbara 4 Wheelers.
99 D2, 3" lift, lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, Warn winch, HID lights and an Engel 45.

(in reply to underpsi)

Post #: 5

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