xFatcatx
Well-Known Member
- Joined
- November 25, 2006
- Messages
- 271
- Reaction score
- 0
- City, State
- PORTLAND OREGON
- Year, Model & Trim Level
- 99 SPORT
I had a few posts about hard cold start and poor idling issues with the 99' Sport, 4.0 SOHC with about 120k miles. The idle would surge a bit and rpm's jumping up and down, it ran very rough overall. Glad to say the problem seems to be fixed, all though will have to wait for a colder morning to 100% sure. List of what I did this morning, basically needed a tune up and glad it wasnt anything major:
-new upper/lower intake manifold gaskets
-cleaned IAC
-cleaned MAF
-cleaned TB
-new plugs/wires
-new PCV Valve
-new thermostat (since I had the manifold off)
I wish I knew exactly what the issue was, but the TB and PCV were filthy, and found a small tear in one of the old plug wires. I am not sure how dirty PCV valves should get, but I am thinking this one was stock as it read motocraft on it....
I highly suggest anyone doing manifold gaskets to change your PCV while your at it as its easily accessible then, along with the thermostat. I read about people having problems with the "T" connection on the PCV, but since I had the whole thing with hoses out of the truck it was easier I guess and the new PCV easily slid right into the "T" connection. I forgot how much fun plugs were in these but with the passenger tire and splash guard off it wasnt to bad I guess.
-new upper/lower intake manifold gaskets
-cleaned IAC
-cleaned MAF
-cleaned TB
-new plugs/wires
-new PCV Valve
-new thermostat (since I had the manifold off)
I wish I knew exactly what the issue was, but the TB and PCV were filthy, and found a small tear in one of the old plug wires. I am not sure how dirty PCV valves should get, but I am thinking this one was stock as it read motocraft on it....
I highly suggest anyone doing manifold gaskets to change your PCV while your at it as its easily accessible then, along with the thermostat. I read about people having problems with the "T" connection on the PCV, but since I had the whole thing with hoses out of the truck it was easier I guess and the new PCV easily slid right into the "T" connection. I forgot how much fun plugs were in these but with the passenger tire and splash guard off it wasnt to bad I guess.