yossarian19
NAXJA Forum User
- Location
- Grass Valley, CA
Background:
98 4.0, AW4.
4 month old battery. Clean terminals, decent cables.
Brand new OEM plugs, wires, cap & rotor, air filter... full 30K and then some within last month
Symptoms:
When cold, the engine has to crank for a little before starting. I have let the pump prime a few seconds, no difference. Crank sounds strong. Once it runs, the idle can be slightly rough but is generally strong at ~1K till warm, ~750 once warmed up. These RPMs are taken at the factory in-dash tach.
When warm, the engine starts up like it was never shut down. Every time - reliable as the tides.
I'd started thinking "fuel pressure regulator" right off the bat.
My old man said "Clean the throttle body & TPS / idle air control / whatever sensors the Jeep has"
My boss, a mechanic, says "Check your fuel control system - whatever crap a Jeep has in it, anyway..." (We are Volvo / Toyota mechanics... my jeep is known as "The #$%Box" around the shop)
From searching, I read that the CTS being bad can lead the jeep to a lean condition making it hard to start when cold. What are the values I should be reading on the DVM when it is cold?
Other common failures?
Thanks!
98 4.0, AW4.
4 month old battery. Clean terminals, decent cables.
Brand new OEM plugs, wires, cap & rotor, air filter... full 30K and then some within last month
Symptoms:
When cold, the engine has to crank for a little before starting. I have let the pump prime a few seconds, no difference. Crank sounds strong. Once it runs, the idle can be slightly rough but is generally strong at ~1K till warm, ~750 once warmed up. These RPMs are taken at the factory in-dash tach.
When warm, the engine starts up like it was never shut down. Every time - reliable as the tides.
I'd started thinking "fuel pressure regulator" right off the bat.
My old man said "Clean the throttle body & TPS / idle air control / whatever sensors the Jeep has"
My boss, a mechanic, says "Check your fuel control system - whatever crap a Jeep has in it, anyway..." (We are Volvo / Toyota mechanics... my jeep is known as "The #$%Box" around the shop)
From searching, I read that the CTS being bad can lead the jeep to a lean condition making it hard to start when cold. What are the values I should be reading on the DVM when it is cold?
Other common failures?
Thanks!