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6-ounces of oil and make sure that you prime the compressor as well........ A 1998 Isuzu Trooper with 3.5 engine actually uses 5 oz of pag-46. You can find alot of helpfull information about your vehicle ac system if you go to www.idqusa.com
how to set the timing on 3.5 liter engine on a trooper 98
Yes if it fits
The engine computer (pcm) controls the injector pulse. It looks at numerous sensors and switches to calculate pulse width
Yes, replace it with a new one.
Need to check the coil wire, and all other ignition parts.
It is located under the upper intake manifold. It is attached to the bank of injector poppets aka "the spider".
Check for trouble codes. Possible cam or crank sensor.
I have owned two Isuzu trooper's. and 88 and a 98. Both having higher mileage I have always used 10W-30. If your truck is burning oil it may help to get a higher viscosity of oil, but 10W-30 will get the job done.
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You can purchase the pump at any auto supply store, Auto Zone, O'Reillys. Advance, etc.
You may have a leaky fuel injector or a faulty check valve in the fuel pump. I vote for the faulty fuel pump.