engine sensors not closing loopback??

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engine sensors not closing loopback??

ok 1991 grand prix 3.1 L MFI engine 101,000 miles
well maintained, no oil usage or exuaghst smoke ever,
just started missfiring badly out of the blue, parts replaced spark plugs. plug wires. all 3 ignition coils firing good,
replaced fuel pump, snap on engine analyzer says the sensors
are not closing the loopback. any ideas?????????

2007-09-15 04:01:22 · 2 answers · asked by justtooeasy1972 1 in Cars & Transportation ➔ Maintenance & Repairs

yes its staying in open loop.

2007-09-15 04:17:00 · update #1

snap on engine analyzer says all senors are good. but says its staying in open loop.

2007-09-15 04:20:41 · update #2

2 answers

More than likely the engine coolant temperature sensor is bad.

2007-09-15 04:18:50 · answer #1 · answered by Mr. KnowItAll 7 · 0⤊ 0⤋

What is the problem with your vehicle, is it staying in open loop?

2007-09-15 11:06:42 · answer #2 · answered by w_scautoonline 1 · 0⤊ 0⤋