Please help 86 150 hesitating badly!!!!
04-07-2011, 11:16 AM
#22
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Now I was able to accelerate it (in park) with out backfireing. I drove it and it bogged down at high rpm but if I drove it nicely it would drive (it would not do this before). With the o2 sensor disconnected, I could hear a lot of exhaust coming out of the hole. Do I have backpressure with my Cat?
This is a common occurrence for these stock engines if higher than 87 octane is used habitually.
If I were you, w/ the o2 still out, I'd do a "Seafoam" treatment. If you have been experiencing a back pressure condition for some time, your combustion chambers are probably loaded up w/ deposits.
Last edited by ymeski56; 04-07-2011 at 12:20 PM.
04-07-2011, 10:13 PM
#23
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This is what I did
Time to take it to a muffler shop. I believe, more than 3PSI pressure at the mount hole constitutes a "back pressure" condition.
This is a common occurrence for these stock engines if higher than 87 octane is used habitually.
If I were you, w/ the o2 still out, I'd do a "Seafoam" treatment. If you have been experiencing a back pressure condition for some time, your combustion chambers are probably loaded up w/ deposits.
This is a common occurrence for these stock engines if higher than 87 octane is used habitually.
If I were you, w/ the o2 still out, I'd do a "Seafoam" treatment. If you have been experiencing a back pressure condition for some time, your combustion chambers are probably loaded up w/ deposits.
04-07-2011, 10:28 PM
#25
Now I am not telling you to do this. I want this known from the start.
Unbolt your pipe flange at the back of the cat. Grab a chunk of pipe. Rammed it up into there. Start your truck, rev it to clean it out. Clean up the mess left. Rebolt the flanges back together.
Problem solved but I did not tell you to do this.
Unbolt your pipe flange at the back of the cat. Grab a chunk of pipe. Rammed it up into there. Start your truck, rev it to clean it out. Clean up the mess left. Rebolt the flanges back together.
Problem solved but I did not tell you to do this.
04-07-2011, 10:33 PM
#26
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Now I am not telling you to do this. I want this known from the start.
Unbolt your pipe flange at the back of the cat. Grab a chunk of pipe. Rammed it up into there. Start your truck, rev it to clean it out. Clean up the mess left. Rebolt the flanges back together.
Problem solved but I did not tell you to do this.
Unbolt your pipe flange at the back of the cat. Grab a chunk of pipe. Rammed it up into there. Start your truck, rev it to clean it out. Clean up the mess left. Rebolt the flanges back together.
Problem solved but I did not tell you to do this.
04-08-2011, 07:47 PM
#28
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In the shop...
Man, now I remember why I do my own labor (as much as I can). So the shop says that it will be $245 for the cat + labor + $70 for diagnostic. They wanted to charge me $125 for the cat alone. Well, I was able to convince them to allow me to buy the cat on my own. I went to autozone and found a cat for $80 + I get a military discount. All this because I need emissions test for the van. Funny thing is that after this year I will never have to get an emissions test! I agree with you Aurorazero, I would have gutted it (even though you never told me that) but I have to pass emissions. 
04-08-2011, 08:34 PM
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Man, now I remember why I do my own labor (as much as I can). So the shop says that it will be $245 for the cat + labor + $70 for diagnostic. They wanted to charge me $125 for the cat alone. Well, I was able to convince them to allow me to buy the cat on my own. I went to autozone and found a cat for $80 + I get a military discount. All this because I need emissions test for the van. Funny thing is that after this year I will never have to get an emissions test! I agree with you Aurorazero, I would have gutted it (even though you never told me that) but I have to pass emissions.
If I remember right, manifold Vac pressure takes a dump when rpm is increased. Example 19-20 psi at idle/ 13-14 psi w/ rpm increase. (w/ clogged Cat)
Your truck doesn't call for two inline cats?
Although a spanking new single should get you through at least one smog test.
Last edited by ymeski56; 04-08-2011 at 08:51 PM.
04-10-2011, 12:33 AM
#30
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Not again!!!
Azzholes. My shop tests for back pressure for free. Was that what they are going to "diagnose"? They can usually tell by how the exhaust is behaving at the end of the tail pipe too.
If I remember right, manifold Vac pressure takes a dump when rpm is increased. Example 19-20 psi at idle/ 13-14 psi w/ rpm increase. (w/ clogged Cat)
Your truck doesn't call for two inline cats? Although a spanking new single should get you through at least one smog test.
If I remember right, manifold Vac pressure takes a dump when rpm is increased. Example 19-20 psi at idle/ 13-14 psi w/ rpm increase. (w/ clogged Cat)
Your truck doesn't call for two inline cats?
Although a spanking new single should get you through at least one smog test.