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Joseph Sluder Posted on Mar 13, 2019
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I have a 2005 Mercury 75 Opti Max I'm getting fire at the plugs but won't star. If I'm getting fire at plugs it's got to be a fuel problem is that correct

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Raymond Richards

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  • Posted on Mar 13, 2019
Raymond Richards
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That is the first step to troubleshooting a no start. Spark, Fuel, Air. Basic small engine troubleshooting. I am sure it is fuel injected. Proper fuel pressure is critical. Check the fuel pump fuse first.
If it is good, and your workspace is quiet, try turning the ignition switch to run position just before starter position and try to hear the fuel pump.
You will still need a fuel pressure gauge to check if fuel presser is within spec. On many vehicles, about 25PSI but only a service manual for that car will have the spec. If it is not to spec and the fuse is good it could be the fuel pump.
Also, timing could be an issue if fuel presser is good.
Best of luck.

2 Related Answers

Anonymous

  • 6982 Answers
  • Posted on May 27, 2010

SOURCE: I have a 95 cherokee with a four cyl. i have fire

cranking is what happens when you turn the key and the engine turns.... Is that what's happening?
If I remember correctly, fuel pressure at the rail should be about 35psi. If higher, check the regulator and the return line.(could be blocked)
Crank sensor sends signal to open the injectors (through computer to asd relay). Get a chiltons manual for good wiring diagrams. Crank sensor is a common failure and definitely should be checked.

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Stephen

  • 21873 Answers
  • Posted on Apr 13, 2013

SOURCE: 2005 mercury mountaineer won't start

Are you saying it is not getting fuel pressure at the injectors ?

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I have seen on manyengines that using high performance plugs can cause problems like your's. If you used split-fire's or platinum 4 plugs change them back to OEM sytle plugs and your problem should be solved. If you used OEM plugs check that none are loose or cross threaded as this can cause a loss of compression.

Let me know what type of plugs you iinstalled and I can try to assit further.
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