Question about 1994 GMC Suburban
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Posted on Jan 02, 2017
My 97 Jimmy was doing the same thing, codes P0740 & P0753 witch are torqe converter lock up & shift solinoid. I unhooked the wires in the drivers side of the trany and cleaned them with contact cleaner bought at the parts store. I reconected the harness and disconected the baterie for a couple of houres and no trouble since.... 4 days so far Knock on wood........ Hope it helps
Posted on Jul 29, 2008
This year of ranger had a few flaws, In one case, a break power booster was robbing the vacumm, you can test this by plugging it off and seeing the differance, but you will have limited brakes. This model year had a problem with a vacuum leak on the manifold. You can check these in many ways, but please don't use starting fluid. The rear of the manifold usually on the drivers side where it seals to the block.
Also, in 2 other cases a cracked head has gave me the same problem. It is caused from a loss of vacuum.
Posted on Jan 15, 2009
SOURCE: high rpm shifting
Does your van have an "EAT" switch -- lower right hand side of instrument panel?
Pressing the switch in changes the shift points by making the transmission shift at a higher RPM.
If the van has the "EAT" switch and it is engaged, try pushing it in again to disengage it.
Posted on Mar 24, 2009
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