If this is the 1.9 litre engine, it should be to the right when you are looking at the truck. Stand on the drivers side of the engine compartment and look down between the engine and the wheel well. It is real low and is a little bit tricky to find the first time. Good luck.
Take the dipstick out ues a funnel and put it in through the dipstick hole!
1-2-4-2
The 1987 Isuzu Pickup 1.9L was originally equipped with a 2 barrel Hitachi DCH340 series carburetor.
under the hood on the driver side in front of the brake booster
I need a vacuum diagram for a 1987 suzu pickup 2.5 lt engine
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Most likely your exhaust pipe has a hole in it. I have seen this issue on a few different Isuzu's, especially diesels.
the oldest vehical made by Isuzu was the pup
certifit.com
Answering "Where is the fuel mixture selonide on a 1990Isuzu Pup?"
how to remove spare tire 1990 Isuzu Pick Up
maybe to save on ruc