Hi folks, looking for some help on how to diagnose my issue, quick breakdown:
I bought a 2001 Expedition with over 200,000 miles, its a California car with full emissions. The owner said the head gasket was bad. When I checked the oil and water no signs of mixing but the coolant was getting pressurized. The truck started and ran and idled fine but seemed to be misfiring bad. Cylinder #1 was dead per the codes it was throwing. After some searching around I figured it more than likely was the intake manifold.
I changed the Intake manifold, spark plugs, new coil on #1 and replaced all the boots on the rest of the coils. Did the passenger side valve cover gasket cause it was leaking, new air filter, new fuel filter, new PCV valve and tube, and cleaned the filthy throttle body.
Fired her up and no more missing in the motor but it felt like I wasn't getting close to full power, lag in acceleration like I was hauling a heavy load.
Based on the dead cylinder and unsure of how long the previous owner ran it like that with unburnt fuel dumping into the exhaust I'm dreading the CARB cats.
The truck sat for over 2 years... so I put fresh gas in and when it was less than a 1/4 tank I ran some CATACLEAN through it and it did help smooth it out on throttle response, but still much to be desired.
I took it up to Tahoe and the mountain climbs were painfully slow but with some time I could get it to do highway speeds on the flats.
SO MY QUESTION IS:
I got under the truck when it was cold started and could smell exhaust on the passenger side, same bank as the dead cylinder. Could a small exhaust leak on the manifold be enough to cause this?
I purchased new exhaust manifolds when I bought it cause I saw its a known issue and the truck has plenty of miles.
If not, what's the best way to test my Cats to be sure they are either good or bad?
Thanks!
I bought a 2001 Expedition with over 200,000 miles, its a California car with full emissions. The owner said the head gasket was bad. When I checked the oil and water no signs of mixing but the coolant was getting pressurized. The truck started and ran and idled fine but seemed to be misfiring bad. Cylinder #1 was dead per the codes it was throwing. After some searching around I figured it more than likely was the intake manifold.
I changed the Intake manifold, spark plugs, new coil on #1 and replaced all the boots on the rest of the coils. Did the passenger side valve cover gasket cause it was leaking, new air filter, new fuel filter, new PCV valve and tube, and cleaned the filthy throttle body.
Fired her up and no more missing in the motor but it felt like I wasn't getting close to full power, lag in acceleration like I was hauling a heavy load.
Based on the dead cylinder and unsure of how long the previous owner ran it like that with unburnt fuel dumping into the exhaust I'm dreading the CARB cats.
The truck sat for over 2 years... so I put fresh gas in and when it was less than a 1/4 tank I ran some CATACLEAN through it and it did help smooth it out on throttle response, but still much to be desired.
I took it up to Tahoe and the mountain climbs were painfully slow but with some time I could get it to do highway speeds on the flats.
SO MY QUESTION IS:
I got under the truck when it was cold started and could smell exhaust on the passenger side, same bank as the dead cylinder. Could a small exhaust leak on the manifold be enough to cause this?
I purchased new exhaust manifolds when I bought it cause I saw its a known issue and the truck has plenty of miles.
If not, what's the best way to test my Cats to be sure they are either good or bad?
Thanks!