Re: 87 Pontiac revisited (bit long, but detailed)

To test for a vacuum leak, just run the engine at idle and spray all
over with anything flammable-- WD-40 is probably the safest. I wouldnt
spray starting fluid, it's a bit too quick to evaporate and mighty
explosive and intoxicating too. The old VW Rabbits would get
hardening of the injector grommets and leak like crazy-- five seconds
of spraying and you knew for sure they were leaking as the idle would
speed up whenever you sprayed.

To test the injectors, pull the wires off them one at a time. No wire
means no injection which should result in lots of engine vibration but
the NOx should drop if the injector's been faulty.

Is the engine hard to start after it's been sitting off for a few
minutes? That might point to drippy injectors. A can of injector
cleaner can't hurt to try.

Good luck.

.

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