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Problem Fuel Injectors -
Where
they are and what to look for.
These problems can't be fixed by cleaning and the injector will need to be replaced.
If you injector is listed, one or more may exhibit the problems below.
Note: Any fuel injector can exhibit these issues but these injectors are prone to have the problems listed.
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JEC's
side-feed - Coil windings will increase in resistance.
Nissan and Subaru (various top colors)
Verify the resistance is within 10% of each other. Normally 10-12 ohms.
JEC's
side-feed - Coil windings will increase in resistance
Nissan and Subaru (various top colors)
Verify the resistance is within 10% of each other. Normally 10-12 ohms.
These also have issues with corrosion of the coil terminals causing intermittent operation. Fortunately the terminals can be cleaned during servicing.
Rochester
Multec - Coil windings shorting out, decreasing resistance
Various
GM late 80's to early 90's (gray or black top)
Verify the resistance is within 10% of each other. Normally 12-16 ohms.
Bosch top-feed external leaking from where pintle stem and main body meets, (just above lower o-ring). Also possible leaking where upper plastic meets metal body.
Mid to late 80's Porsches. Injectors from 944's very prone to this issue. Various part numbers in both gray and green.
Look for fuel leaking from where the top plastic meets the metal body. Also look for wetness around the bottom of the injector when it is installed.
Siemens,
Deka or Bendix - External leak were plastic meets the metal
body.
Late
80's Jeep 4.0
Look for fuel leaking from where the top plastic meets the metal body.
Mitsubishi
- External leak were plastic meets the metal body.
Late
80's Turbo 2.6 Starion, Conquest, etc
Look for fuel leaking from where the top plastic meets the metal body. A very common problem.
Denso
- Coil windings will increase in resistance.
90's Toyota (various top colors)
Verify the resistance is within 10% of each other. Normally 12-14 ohms.
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