I have a 86 cherokee laredo that starts only when it wants to. I cannot hear the fuel pump when it chooses not to start but when it does it runs great. I have changed the pump twice,the strainer the filter the pump relay and the crank sensor. i have shot voltage at the harness for the pump when not working and i get 6 volts. I am at my whits end and have no clue where else to look. Any help would be greatly appreciated.
starting prbolems
- Thread starter raveneng
- Start date
MudderChuck
New member
Need help getting my new Jeep home (wheel question)
Take a look at the spade connectors, under the relay, and all the connectors back to the fuel pump (to include grounds). I´m not real familiar with the setup on the 86, most of my experience is on 87-90/91.
Disconnecting the fuel line at the front and the filter and blowing some air backwords through the system, has shown me in the past just how much crude and rust flakes can built up in the hard lines.
If the fuel pump relay is anything like the post 86, the holder/connector block can be removed and turned upside down, what´s under there may be shocking. On the 87 and newer models the fuel pump ran through the starter relay, which can also get pretty cruddy inside.
The 87 had a wiring glitch in the fuel pump relay, don´t know if it was a holdover from the 86 or not, two wires have to be removed and the locations reversed, a recall list for your 86 may be helpfull.
Take a look at the spade connectors, under the relay, and all the connectors back to the fuel pump (to include grounds). I´m not real familiar with the setup on the 86, most of my experience is on 87-90/91.
Disconnecting the fuel line at the front and the filter and blowing some air backwords through the system, has shown me in the past just how much crude and rust flakes can built up in the hard lines.
If the fuel pump relay is anything like the post 86, the holder/connector block can be removed and turned upside down, what´s under there may be shocking. On the 87 and newer models the fuel pump ran through the starter relay, which can also get pretty cruddy inside.
The 87 had a wiring glitch in the fuel pump relay, don´t know if it was a holdover from the 86 or not, two wires have to be removed and the locations reversed, a recall list for your 86 may be helpfull.
Sorry it is definatly not getting fuel when it doesnt start. i shoot 6 volts at the wire harness at the fuel pump. I have swapped the relay with the others in that row no difference i also jumpered across terminals 30 and 87 of the fuel pump relay still nothing. It will fire and run for a second when i add fuel to the throttle body but as soon as the little spray of fuel stops the engine stops. It is a 2.5 liter 4 cylinder throttle body fuel injection. Also i do not hear the pump anymore for the 2 seconds that it should turn on i used to and on the occasion that it does start i hear it.
Thanks Again
Thanks Again
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