I have had a exhaust leak at the manifold end to the exhaust connection that has been getting worse and worse. But I have also been having a very acceleration issue too and wondering if they are connected? If I slowly start into the throttle until like 15 mph and then try to gun it the vehicle totally bogs down, it will not down shift or anything just slowly accelerate. If I start out from a stop full throttle it does just fine, but if you are just cruising and try to pass of something it is like dead in the water. This problem started off hardly noticeable but now has gotten bad over the last few months. I have changed the fuel filter, transmission filter and fluid(except torque convertor). All new plugs and cops. Could it but a torque convertor? Or the exhaust leak or am I way off?

Any suggestions? I am going camping next week and am not looking forward to trying to pull my pull up with this truck.

 

Anybody?????

 

All that and it doesn't throw any codes?
For some starter thoughts...
Have you been thru all the vacuum lines, replaced/cleaned the EGR and PVC valves, cleaned/replaced the IAC valve and cleaned the MAF?
Checked the fuel pressure at the Schrader valve on the fuel rail?
How about taking it to a shop (or you do it) and having the exhaust leak fixed?

 

I am planning on taking it in to get the leak fixed just trying to get some directions in the meantime. It doesn't throw any codes and has a new Pcv valve. I will have to look into the rest of the stuff.

 

Ditto what Boat tug said. I just cleaned my IAC and my truck is like a race car now. I too had the slug fest going on. Exhaust leak shouldn't cause slug. It actually lets the beast breathe a little more.

 

This also could be caused by a bad throttle position sensor, You coul dhave a flat spot or dead spot in the sensor causing the difference from a slow star to wide open throttle and if the exhaust leak is getting worse....you could have a plugged cat...if you take it to a exhaust shop have them loosen the flange bolts on both sides so it can breathe and take it for a ride and if it don't act up you found your problem....you also could have a dirty throttle body...my 2 cents

 

Just wondering. How much slack is supposed to be in the throttle cable?

 

An exhaust leak upstream of the fuel control O2 sensor can mess up the fuel mixture and cause drivability problems. In between each exhaust pulse, a small vacuum will suck air into the exhaust stream. The O2 sensor sees this excess oxygen and drives the injectors rich to make up for the excess oxygen. This makes the engine run too rich and bogs the engine down. But it runs well at full throttle as you will get best power at a slightly rich mixture.

 

I went and fixed the exhaust leak. The two studs that hold the exhaust to the manifold were trashed. One was already broken and the other literally had an 1/8" of bolt left holding. I tried to grind the bolts flat with the manifold and then drill them out so I could put new bolts in and do it that way. Apperantly the studs used are made out of diamond, cause I could not drill them. So I ended up taking the manifold off, which suprisingly came off easy. 13 yrs old and in the rust belt and all the studs expect three came completely out, the other 3 just the nuts came off. Cleaned them up reinstalled new studs and gaskets. Tired to torch the old studs out of the manifold and chase them with a drill bit so I could reuse it but no such luck, got one side done but a took a little to much out on the other side and cut through the manifold. Off to oriellys for a new manifold and egr pipe. $165 dollars later no exhaust leak.

I went ahead and cleaned the iac. Between the two it helped out a lot. It is still there but defiantly better. I was going to buy a throttle position sensor and see if that helps but the guy at oriellys said normally when they go bad it throws a code. This that correct? Any other suggestions.

On a side note, if I ever meet the engineer who decided to run all the cooling lines in the way and shove the motor so far back I can't hardly get my XL hands in there to do anything......I probably will punch him

 

Punch him one time for me too, and I have small hands !