Revisiting a CEL issue..

RayES2

New Member
I have an ES2 with a D17A2 with a CEL and rough running issue.
Replaced the following so far per regular maintenance; all items are less than 5 months old:
Coils (DENSO)
Plugs (NGK)
A/f ratio sensor (DENSO)
02 sensor (NTK)
EGR Valve with new gasket
Cleaned EGR Passages
Inspected for vacuum leaks
Inspected injectors; no clogs, clean and like new spray pattern
changed thermostat and did a coolant flush
did valve cover gasket with spark plug tube seals and cam plug
both injector base and plenum gasket were done with t/b gasket

Compression and leakdown tests show no failure of piston rings and head gasket, compression was 200 in every cylinder from what the tech told me. Tech found no leaks.

codes are p0300, p0301, p0302,p0303 and p0304.

anyone else able to chime in and give me an idea what it may be?
 

RayES2

New Member
Is the fuel in the tank very old?

Have you measured the fuel pressure?
Fuel is always fresh and fuel pressure is good. I'm beyond baffled by this point, really.
 




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