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Old May 9th, 2012, 06:57 PM
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Chris Davis
94 D90, 88 RRC
Join Date: Nov 2003
Location: Colorado
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Running hot--new plugs?

Ok, so now that it is warm out, my previously cool running D90 is not running hot when going uphill. I have a block tester, so I did that and stayed blue :-) I adjusted my timing--no change.

I put an entire new front cover on the engine--so new water pump is the only real change. Fans didn't change because I am running a dual Flexalite electric fan. While the radiator was out, I had a leak in it fixed so it should be good (it looks good, I am going to measure the temp in/out next). I changed the plugs to Bosch Platinum +2 which I have never used before and quite frankly, only got them cause they were out of the champions.

I am going to check all the culprits, including the thermostate, radiator cap, all that shit. But these are those "no gap adjust" plugs with two electrodes on them--I am leaning toward that. Since I am not going to dick around with it tonight, I just wondered if anyone has had good/bad experiences with that plug or have any ideas on this situation.

Everything runs great---and it cools down when I am not going uphill...


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Old May 9th, 2012, 07:12 PM
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Charles Galpin
'94 D90 ST, '63 SeriesIIA
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Join Date: Jan 2004
Location: South Riding, VA
Posts: 11,539
Make sure you have properly burped the cooling system. No better ideas than that, sorry.

Originally Posted by pendy
I'm here for the D's
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Old May 9th, 2012, 07:38 PM
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1995 SW #487/500
Join Date: Sep 2003
Location: The Old North State
Posts: 7,406
To start with those Bosch plugs away and get a set of Champions or NGK's. BPR5EY is the NGK part number.

Did the shop flow test the radiator before they sent it out?
Poor gas mileage gets you to the best places on earth
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