caddypete Posted April 23, 2008 Report Share Posted April 23, 2008 have had a random miss setting a P0300 code, I had a friend put a tech 2 scan tool on it and he said the rear bank was randomly misssing on all cylinders but at seperate times. I figured it must be the coil pack going bad. I got a steal on a set on Ebay off a 2002 STS, both coil packs and all boots for 25.00 and 25.00 shipping. I also noticed he had the fuel rail with FPR and all injectors, got that for 10.00 and 20.00 shipping. After changing rear coil pack there was still a miss. I noticed a air leak sound and couldn't tell if it was just the intake noise. I decided to change out the boot between the TB and intake, because I have seen that mentioned many times on here that they crack and cause problems. Sure enough it had a crack in it near the bottom where it would never be seen. The car runs great so far after about 35 miles. I also found a mouse nest in the valley under the intake, the wires that run to what ever sensor that is down in the valley on the rear bank were strppped almost bare, so I cut it out and replaced those wires. That eventually would have caused me headaches I'm sure. Now I am very content with my Caddy again. Forgot to mention I recieved a ticket Sunday because of that engine miss, I found when it missed you nail the pedal and the miss would clear up, well The engine caught and launched the car as I crested a hill and coming the other way was a state officer and he nailed me for 63 in a 45. Oh well at least it is fixed now. Link to comment Share on other sites More sharing options...
BodybyFisher Posted April 23, 2008 Report Share Posted April 23, 2008 How did you replace those wires? Did you solder them? Glad you figured it out, that boot is a bit problematic, we have seen it go bad about 3 or 4 times now. What did the old one feel like, was it dry and stiff? Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
caddypete Posted April 23, 2008 Author Report Share Posted April 23, 2008 How did you replace those wires? Did you solder them? Glad you figured it out, that boot is a bit problematic, we have seen it go bad about 3 or 4 times now. What did the old one feel like, was it dry and stiff? I soldered them and put heat shrink tube over them. Yes the rubber was hard and dry, and much more compressed than the new one. It is irratating all the months of headaches for a 20.00 part and 40 min of work Link to comment Share on other sites More sharing options...
BodybyFisher Posted April 23, 2008 Report Share Posted April 23, 2008 How did you replace those wires? Did you solder them? Glad you figured it out, that boot is a bit problematic, we have seen it go bad about 3 or 4 times now. What did the old one feel like, was it dry and stiff? I soldered them and put heat shrink tube over them. Yes the rubber was hard and dry, and much more compressed than the new one. It is irratating all the months of headaches for a 20.00 part and 40 min of work Nice job soldering and using heat shrink tubing, that is the correct way to do it! Logan was the first to find one of those boots cracked.. Glad you got it fixed finally. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
joeb Posted April 23, 2008 Report Share Posted April 23, 2008 i had my TPS off to check it. so i than have to unbolt the TB to access the boot in question? this pic was from last summer when i had my motor out for the HG job. maybe i jostled the intake enough to somehow crack or damage this boot. Link to comment Share on other sites More sharing options...
BodybyFisher Posted April 23, 2008 Report Share Posted April 23, 2008 Joe the Plenum is circled in this photo, we don't have this on our 96, Mike Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
ALtheNewsGuy Posted November 2, 2008 Report Share Posted November 2, 2008 have had a random miss setting a P0300 code, I had a friend put a tech 2 scan tool on it and he said the rear bank was randomly misssing on all cylinders but at seperate times. I figured it must be the coil pack going bad. I got a steal on a set on Ebay off a 2002 STS, both coil packs and all boots for 25.00 and 25.00 shipping. I also noticed he had the fuel rail with FPR and all injectors, got that for 10.00 and 20.00 shipping. After changing rear coil pack there was still a miss. I noticed a air leak sound and couldn't tell if it was just the intake noise. I decided to change out the boot between the TB and intake, because I have seen that mentioned many times on here that they crack and cause problems. Sure enough it had a crack in it near the bottom where it would never be seen. The car runs great so far after about 35 miles. I also found a mouse nest in the valley under the intake, the wires that run to what ever sensor that is down in the valley on the rear bank were strppped almost bare, so I cut it out and replaced those wires. That eventually would have caused me headaches I'm sure. Now I am very content with my Caddy again. Forgot to mention I recieved a ticket Sunday because of that engine miss, I found when it missed you nail the pedal and the miss would clear up, well The engine caught and launched the car as I crested a hill and coming the other way was a state officer and he nailed me for 63 in a 45. Oh well at least it is fixed now. Link to comment Share on other sites More sharing options...
ALtheNewsGuy Posted November 2, 2008 Report Share Posted November 2, 2008 What is funny is that I had the same problem with my DHS & found a mouse nest under the plenum. They had neatly stripped the surface off the hood insulation and made a nice comfortable nest on the passenger side. Where did you by your replacement boot & how much did it set you back. I had a lot of carbon build up from the TB, through the plenum, & in the intake chambers. Injectors seamed fine. cleaned most of it up manually. Wonder if the rich fuel mixture brought on by the leak caused the excessive carbon build up. Any fuel additives & intervals suggested to clean up what has built up inside the motor. Link to comment Share on other sites More sharing options...
BodybyFisher Posted November 2, 2008 Report Share Posted November 2, 2008 What is funny is that I had the same problem with my DHS & found a mouse nest under the plenum. They had neatly stripped the surface off the hood insulation and made a nice comfortable nest on the passenger side. Where did you by your replacement boot & how much did it set you back. I had a lot of carbon build up from the TB, through the plenum, & in the intake chambers. Injectors seamed fine. cleaned most of it up manually. Wonder if the rich fuel mixture brought on by the leak caused the excessive carbon build up. Any fuel additives & intervals suggested to clean up what has built up inside the motor. We used to have one of the Northstar Powertrain engineers here. He said that what you see in your intake is NOT an issue, I think he said that EGR gases condense and create the gooey carbon gunk you are seeing, pay no attention to that, just clean your thottle body really good especially the rear of the throttle plate, where that carbon goo builds up. I don't think you will find that rubber plenum anywhere but the dealer or a GM parts supplier. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Ranger Posted November 2, 2008 Report Share Posted November 2, 2008 Yup, what you saw in the TB and manifold is a combination of oily crankcase gases from the PCV and exhaust gases from the EGR. Normally they get ingested and burnt, but when you shut down, they settle out in the manifold and condense on the inside of the TB. It's normal, but it is the reason that regular TB cleaning is necessary. If you do it yearly, it is not a bad job. Wait for 50 or 60 thousand miles and it becomes a bit of a chore. Link to comment Share on other sites More sharing options...
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