My bone stock m20b25 with 90K on it is very hard to start cold, but runs strong and smooth even before the coolant warms up. It cranks strong, but takes a long time to fire when the temperature is below about 45F. Idles rough for maybe 10 seconds, then smooths out. Starts right up when warm. Gas mileage is fine and it passes smog.
Recent maintenance includes:
new VDO fuel pump
spark plugs, rotor, distributor cap
rebuilt and flow tested injectors
oxygen sensor
EDIT: replaced both coolant temperature sensors (to cluster & DME)
The ICV moves freely and the idle is steady.
Smoke test was done recently and all vacuum leaks were fixed.
Instead of paying my corner mechanic a couple hundred bucks to diagnose this thing, I'd rather throw that value of parts at it. What would you try next, and in what order, or what DIY diagnostic would I do at this point?
Recent maintenance includes:
new VDO fuel pump
spark plugs, rotor, distributor cap
rebuilt and flow tested injectors
oxygen sensor
EDIT: replaced both coolant temperature sensors (to cluster & DME)
The ICV moves freely and the idle is steady.
Smoke test was done recently and all vacuum leaks were fixed.
Instead of paying my corner mechanic a couple hundred bucks to diagnose this thing, I'd rather throw that value of parts at it. What would you try next, and in what order, or what DIY diagnostic would I do at this point?
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