my 89 305 tpi irocz is throwing codes 24 and 34. shuts down after a few minutes of driving and goes 500 rpm on idle. runs fine on highway speed. called two local chevy dealers and gave me two different opinions about vehicle speed sensor (code 24). one said, since i got 5 speed with speedometer cable, i shouldn't have a vss. the other dealer said my vss is inside the dashboard and cost $209 to replace. by the way, speedometer and that idiot shift light don't work (vss related). any opinions? also any way to test the maf to check on that code 34. please reply and thanks.

 

VSS Is On The Back Of The Cluster And There Is No Way I Paid $209.00 When I Replaced Mine.I Beleave I Got Mine At The Parts Store For Like $35.00 It Was Made By Borg Warner.

 

that's a big difference in price. probably cheaper in usa than in canada. the $209 canadian is from a chevy dealer in town, probably the same price across canada. maybe i would place an order in states but where? does summit or autozone have it?

 

Autozone May Have It I Try Not Shopping At Them Discount Chains If You Can't Find One Shoot Me An E-Mail And I Will See What I Can Get One For. I May Have A Spare.

 

i just made a post on the maf check.... i believe this is to test everythig with the maf, maf power/burnoff relays, ecm, and shorts.

Code 33 tests.

First check air ducts for cracks, holes and tighten clamps.

With the ignition off, unplug the MAF and apply power to ALDL terminal
"G". Check the red wire on the MAF connector for power. If no power,
verify 12v on relay connector orange and white/tan wires. Verify the
connector black/white wire is grounded. Verify black wire from MAF
connector terminal B to ECM connector A11 with an ohm meter. Verify
red wire from relay connector to MAF connector with an ohm meter.
If all is good replace MAF power relay.

Turn ignition on, Check MAF connector dark blue wire for 12v, if so,
unplug MAF burn off relay and check again. If so, check relay
connector black wire for ground. If so, the black wire is shorted to
ground or the ECM is bad. If not, replace MAF burn off relay.

If the dark blue wire at the start of the above test had no voltage,
check the MAF connector dark green wire with ignition on for a 5v
reference signal. If so, and all connectors are good, replace MAF.
If no 5v reference on dark green wire, verify it from the MAF connector
to ECM connector B12 with an ohm meter. If the wire is good replace the
ECM. If the dark green wire has 12v on it, turn ignition off and unplug
the ECM connectors. Turn ignition back on and check again, if so,
it is shorted to power somewhere. If not, and all connectors and
grounds are good replace ECM.