1987 bronco 4.9l straight 6 issue - Ford Forum - Enthusiast Forums for Ford Owners

Ford Bronco One of the original SUVs, offered in both a full size Bronco, or the more compact Bronco II.

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Old 04-25-2018, 10:22 AM
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Default 1987 bronco 4.9l straight 6 issue

Hey guys I just got a 1987 Ford bronco with the 4.9l in-line 6. It has been sitting for about 2 years. Sometimes it is hard to start without starting fluid but when it starts it will start up every time until it sits overnight. It idles good but if you give it a lot of gas itís like it smothers out and almost dies until you let off. If you ease into the throttle it will rev up as high as you let it and it will hold at that rpm. The fuel pumps had good pressure. Has a new fuel pressure regulator and a new fuel pump relay. It was missing a vacuum hose from the vacuum tee to the map sensor. If you put that hose on it will start sputtering and almost dies. I know itís a lot but any help would be greatly appreciated
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Old 04-25-2018, 07:53 PM
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Map sensor wire colors shoud be;
Blk-Wht = Grd
Drk Blu-Lt Grn= Signal to ECA
Org-Wht= 5 Volt Ref
With Key on engine off KOEO
Signal wire to ECA should read 1.55 - 1.63 Volts Anything else, replace MAP
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