- 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.

 


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 and BMWs. Injectors from the 944's very prone to this issue.
Some of the affected part numbers are:
0280150158
0280150201
0280150803
0280150811

 

Leaking Bosch injectors

 

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

Mitsubishi Starion . Conquest

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)

 

Denso problem injector

 

Verify the resistance is within 10% of each other. Normally 12-14 ohms.


Rochester Multec - Leaking that can not be fixed, symptoms are hot starting..

454 GM

17109569

Weber pico style - Coil winding is intermitent or open.

Aftermarket FI systems, VW. Various part numbers IWP-XXX.

 

 

Verify the resistance is within 10% of each other. Be careful handling them as the electrical connector is not as mechanically solid as most other injectors.