Heat wrap: EGR tube, harness or both
- Thread starter Backwoods Rambler
- Start date
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Thank you George
Just noticed this last night:
How are you guys able to get back there and wrap it? I saw the post with the guy laying across the shovel on top of the engine to reach back there, but it seems like so little space to be able to wrap insulating tape around the wiring harness. Are you removing things to be able to wrap that area of the harness by the EGR pipe?
How are you guys able to get back there and wrap it? I saw the post with the guy laying across the shovel on top of the engine to reach back there, but it seems like so little space to be able to wrap insulating tape around the wiring harness. Are you removing things to be able to wrap that area of the harness by the EGR pipe?
With a pair of wire cutters you can cut the zip ties and carefully remove the old crusty wrapping. I removed the EGR modulator and its mounting bracket for better access. Once the zip ties are removed the harness is easier to manipulate.
Once you confirm all of the wires are ok then cover it up with electrical tape followed by wire loom. Be sure and zip tie the wire bundle so it can't touch the hot egr pipe.
Like others I disabled the EGR with the resistor method and looped the vacuum lines back into themselves. No more code 71, no more hot EGR pipe and no more misfire from burned wires.
Once you confirm all of the wires are ok then cover it up with electrical tape followed by wire loom. Be sure and zip tie the wire bundle so it can't touch the hot egr pipe.
Like others I disabled the EGR with the resistor method and looped the vacuum lines back into themselves. No more code 71, no more hot EGR pipe and no more misfire from burned wires.
The area is hard to reach no doubt. I recall kneeling on the valve cover with a towel folded up under my knee, my feet were over by the air cleaner. Don't put any weight on the radiator.
Anyone have a vid or step by step ins with pics on how to get this done? Tia
Not really vid worthy. You literally look at the large bundle of wires running down the firewall just behind the driverside's side of the head. You will see where the wires cross the EGR tube (about 1/2" metal tube) you just take your choice of insulating wrap. I like the DEI stuff and wrap it around the wires so they are insulated from the EGR tube.
Ha, took pix exactly like this a few days back.
fourtrax
SILVER Star
i think some stainless zip ties would be better
https://www.amazon.com/Vktech-100pc...pID=41sL1hNxSVL&preST=_SY300_QL70_&dpSrc=srch
https://www.amazon.com/Vktech-100pc...pID=41sL1hNxSVL&preST=_SY300_QL70_&dpSrc=srch
LC4LIFE
Supporting Vendor
I have been running plastic for over six years to solve this with no issue. The reason I did not go to the metal zip ties was for fear of it cutting through the wrap and then the wiring over time. I figured with the constant vibration it may not be a good idea.
fourtrax
SILVER Star
good to know.
I have ran DEI exhaust wrap on my street bike header for years using stainless ties, never had any issues with the wrap.
I have ran DEI exhaust wrap on my street bike header for years using stainless ties, never had any issues with the wrap.
bwesty
SILVER Star
I bought one of these to try. Fits the EGR pipe well. Small size is the one I went with, could probably use the next size up too. It should help buffer some of the direct heat.
I did the install at the same time I was replacing the heater valve to have more room back there to work.
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Having the harness tied in place is more important than type, amount of wrap. The factory clip dies from age, a couple of zip-ties work fine.
bwesty
SILVER Star
Good to know. I think mine is tied up well but i will look again closer.
Having the harness tied in place is more important than type, amount of wrap. The factory clip dies from age, a couple of zip-ties work fine.
Having the harness tied in place is more important than type, amount of wrap. The factory clip dies from age, a couple of zip-ties work fine.
How much room between the harness and EGR pipe is there when the harness is in the right place? I wish I had remembered to check this and rewrap when my TB was off. I do need to do the Heater Control Valve and its hoses so going to try rewrapping then anyway.
I went a different route when dealing with this problem. I took a flat piece of aluminum sheet metal, cut it to size, and using a bench vice as a sheet metal break i bent it into the appropriate shape to fit between the EGR tube, and the harness. The finished heat shield kind of resembles the shape of the letter Z.
Next i cut some high temp silicone rubber the same length and width as the aluminum heat shield. I formed and attached the silicone rubber to the heat shield with pop rivets. Last, i drilled a hole through the heat shield so it could be held in place by a piece of all thread.
The silicone rubber faces the harness and acts as a high temp insulator, the Aluminum acts as a heat reflector, reflecting the heat away from the harness.
On the intake manifold on my 94, close to the EGR tube is an unused threaded hole. I decided to use that hole as the anchor point to mount my heat shield to.
For the anchor i used a short piece of metric all thread that i screwed into the intake manifold, it's locked in place on the manifold with a jam nut. On the other end of the all thread is where the heat shield is mounted. The heat shield is held in place by being sandwiching between a welded in place nut, and a jam nut.
Next i cut some high temp silicone rubber the same length and width as the aluminum heat shield. I formed and attached the silicone rubber to the heat shield with pop rivets. Last, i drilled a hole through the heat shield so it could be held in place by a piece of all thread.
The silicone rubber faces the harness and acts as a high temp insulator, the Aluminum acts as a heat reflector, reflecting the heat away from the harness.
On the intake manifold on my 94, close to the EGR tube is an unused threaded hole. I decided to use that hole as the anchor point to mount my heat shield to.
For the anchor i used a short piece of metric all thread that i screwed into the intake manifold, it's locked in place on the manifold with a jam nut. On the other end of the all thread is where the heat shield is mounted. The heat shield is held in place by being sandwiching between a welded in place nut, and a jam nut.
