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2001 CL, random misfire on all cylinders. Checked plug gaps,

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no vacuum leaks, cleaned egr...
2001 CL, random misfire on all cylinders. Checked plug gaps, no vacuum leaks, cleaned egr valve, checked coil packs. Next step?
Submitted: 3 years ago.Category: Acura
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Answered in 25 minutes by:
6/19/2015
Mechanic for Acura: Eric, Automotive Repair Shop Manager replied 3 years ago
Eric
Eric, Automotive Repair Shop Manager
Category: Acura
Satisfied Customers: 35,192
Experience: 20+ yrs. experience as repair shop manager and technician.
Verified
HI,
You need to check fuel pressure.
With the fuel pressure regulator vacuum hose disconnected and clamped 324 - 373 kPa (3.3 - 3.8 kgf/sq.cm, 47 - 54 psi)
With the engine running, reconnecting the vacuum hose 270 - 320 kPa (2.75 - 3.25 kgf/sq.cm, 40 - 46 psi)
If below specs, replace the pump. If above specs, replace the fuel pressure regulator.
If within specs, and more than 90,000 miles since the valves were adjusted, you need to adjust the valves. This is a must every 90K miles, otherwise it will get misfires
Please remember to rate service using the rating page so that I may receive credit. Thanks
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Customer reply replied 3 years ago
Fuel pressure good, adjusted valves first actually & most were within tolerance. Had battery tested as well. Cleared codes with obd scanner & praying for the best. At least transmission is good at 185,000 miles on this CL
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