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EGR Intake Port Blocking Plate? 200 1991

posted by  Dave Stevens on  Sun Jun 26 19:13 CST 2022
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last visit: Sun Jan 1 02:36 CST 2012
[RELATED]

Aha, that might explain why I've not bumped into a cold start injector in the past 30+ years. All my LH-2.x engines have had EGR to help meet Canadian pollution specs which are basically as rigid as California. I'm now guessing it was seemingly more convenient for Volvo to eliminate the cold start injector to be able to use that hole in the existing intake manifold for EGR rather than change the manifold or have two different ones. I imagine a few extra pulses of the injectors by the ECU during initial cold startup cranking easily replaces a cold start injector. The fuel pumps have already been spun up for a couple of seconds by the ECU as soon as the ignition is switched on so there should be enough pressure to get a reliable amount of fuel. EGR needs a different ECU anyway so just one little extra bit of programming to accomplish that and no new manifold needed for production lines and parts chain, not to mention no more cold start injectors. If I'm right, that begs the question why they didn't do that in all the engines?
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now






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