Question about 1991 Ford F350
Good question. On petrol engines there is a throttle plate that governs the amount of air entering the engine. At idle the throttle is almost completely closed and a result is the a vacuum is created in the inlet plenum. This vacuum is used to control ancillary engine related functions: opening the engine's exhaust gas recirculation (EGR) valve; operating the intake manifold runner (IMR) valve; moderating the fuel pressure regulator (FPR) function; and in governing in-gear duration (automatic transmission) and vehicle functions such as central locking, fuel cap door release and brake servo assist. OK so what has this to do with diesels? Diesels do not have throttles, engine speed is governed by fuel injection volumes. Without an air throttle the diesel engine does not have a vacuum to run the ancillary vehicular functions. Since many of the ancillary devices have already been made to operate with petrol engines it is simpler add vacuum pump to the diesel engine and use the same components to do the same jobs.
Posted on Nov 15, 2010
It makes your brakes and cruise control work i just had that fixed on my truck
Posted on Jan 30, 2011
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Posted on Jan 02, 2017
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