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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 21879
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have a 1989 Bentley turbo R. I suffered a distinct loss of

Customer Question

i have a 1989 Bentley turbo R. I suffered a distinct loss of power on the motorway but carried on running. It feels like it is misfiring, is that likely and what is the likely cause
Submitted: 1 year ago.
Category: Car
Expert:  Matt replied 1 year ago.
Hellothis is quite possibleif you have no check engine or other fault light on then I'd start by measuring the fuel pressure on a running engine, you need to attach mechanical gauge to the fuel injector rail and it should be about 3 Bar (44 psi)if low then 1st replace the fuel filter and then check over the power supply to the fuel pump Check the resistance of the spark plug leads ( 13-15Kohm / metre) and replace if any doubt or high resistance - Also replace the spark plugs if any of them fail this checklist:http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp You can also try spraying some water on the coil pack with the engine running. It is possible the coil is faulty and causing the misfire. If you see sparks arcing with the water, then replace the coil.I'd check the condition of the injector plugs / connections as this could be a lean misfire if an injector isn't firing properly - the best way to check this is with a 'noid' light http://www.noidlight.com/ Then check all the connections to the engine sensors one at a time, remove each one and examine for signs of corrosion or damage and a squirt of contact cleaner ( not WD40) will also help.
Expert:  Matt replied 1 year ago.
Hi
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