Gremlin after sandblasting frame.

[harrisonmonroe]

‘94 … So I sandblasted and coated the frame and now I have a gremlin.

Right after finishing I went to move it and power cuts off at 2000rpm. Idles fine. P D and 2 are dimly lit (they are led so sensitive) which makes me think electrical. Drove it and same thing.

Cleaned transmission range sensor as an easy culprit and there was definitely sand on it.

Same symptoms.

Let it sit overnight as my frustration grew and drove it this morning with zero (limp) issues other than the dash lights. It was also flickering some warnings but not staying lit last night. None of that this morning and the P even went off while driving.

How do I remove this gremlin!?

 

[NeverFinis]

Wait, you sandblasted while body was on frame?

I would probably check and clean all the connectors between the transmission and the ECM. Might as well check chassis and body grounds as well.

More than one gear light on means you need to check your Park/Neutral Position Switch.

 

[robnicko]

does your volt meter normally sit where it is in the pics?
to me it seems a bit low but could just be the gauge, you may want to check voltage with a multimeter when the engine is running

 

[harrisonmonroe]

does your volt meter normally sit where it is in the pics?
to me it seems a bit low but could just be the gauge, you may want to check voltage with a multimeter when the engine is running

it does. I've never noticed anything different but worth a check

 

[harrisonmonroe]

Wait, you sandblasted while body was on frame?

I would probably check and clean all the connectors between the transmission and the ECM. Might as well check chassis and body grounds as well.

More than one gear light on means you need to check your Park/Neutral Position Switch.

Weird part is they aren't "on" per se. They just are dimly illuminated then they are on when that gear is selected. They are LED so definitely touchy with volt changes. That's how I suspect it is a connection/electrical.

 

[80t0ylc]

Also check your harness from the firewall to the intake manifold by the EGR. If the harness looks melted, you need to fan out the wires and check them all for melted and missing insulation.

 

[60 toy ota]

Putting money on a floating ground finding a way through the nss circuit. Check for sand damaged ground on your transmission position switch

 

[harrisonmonroe]

Putting money on a floating ground finding a way through the nss circuit. Check for sand damaged ground on your transmission position switch

Have taken apart, cleaned, and greased pretty much every connection under the truck I could find. Same issue. Although it drives fine and haven't had the limp issue since day 1. Lights are still flashing and the gear ones still dim.

 

[harrisonmonroe]

Putting money on a floating ground finding a way through the nss circuit. Check for sand damaged ground on your transmission position switch

Have taken apart, cleaned, and greased pretty much every connection under the truck I could find. Same issue. Although it drives fine and haven't had the limp issue since day 1. Lights are still flashing and the gear ones still dim. All grounds I have found I sanded and reattached.

 

[harrisonmonroe]

Also check your harness from the firewall to the intake manifold by the EGR. If the harness looks melted, you need to fan out the wires and check them all for melted and missing insulation.

Have taken apart, cleaned, and greased pretty much every connection under the truck I could find. Same issue. Although it drives fine and haven't had the limp issue since day 1. Lights are still flashing and the gear ones still dim. All grounds I have found I sanded and reattached.

 

[harrisonmonroe]

Wait, you sandblasted while body was on frame?

I would probably check and clean all the connectors between the transmission and the ECM. Might as well check chassis and body grounds as well.

More than one gear light on means you need to check your Park/Neutral Position Switch.

Have taken apart, cleaned, and greased pretty much every connection under the truck I could find. Same issue. Although it drives fine and haven't had the limp issue since day 1. Lights are still flashing and the gear ones still dim. All grounds I have found I sanded and reattached.

 

[80t0ylc]

Also check your harness from the firewall to the intake manifold by the EGR. If the harness looks melted, you need to fan out the wires and check them all for melted and missing insulation.

Have taken apart, cleaned, and greased pretty much every connection under the truck I could find. Same issue. Although it drives fine and haven't had the limp issue since day 1. Lights are still flashing and the gear ones still dim. All grounds I have found I sanded and reattached.

I’m not talking about connections. I’m talking about condition of the harness itself. This section I’m talking about is notorious for causing twilight zone problems due to heat damage. It gets melted from the heat and wires will short out that have no relation to each other, but the results are unpredictable. It kind of sounds like your problem is why I’m suggesting it.

 

[TheBussman]

ohm test that transmission range sensor, every pin to ground also. if that passes i would load test it also. With it unplugged none of the lights light up correct? i have a used one if you need it.