05-26-2017, 05:13 AM
lots of causes.
but Ill list top ones, most.
that low, would be gross misfiring , i sure you can hear that.
bad spark?
or egr valve stuck open
dis you scan it first? OBD2 scan tool works here, any made. works, then to now, USA.
id not hot wire that ISC, even with 14ohm coils 14watts there is going to get too hot. you can clean it and the EGR, that is electric EGR too.
when the RPm drops
just move the right foot a tiny bit, idle up now, (easy ,hard or impossible)
easy, ISC
hard, EGR
impossible , fuel starvation.
id use a scan tool and look for any DTCs set, running, some own set until 2 trips. but you can watch live data, and see what works and not.
im sure it has P300s (or p030x codes) misfire. but what else? or is it only 1cylinder that misfire, check pendings for early DTCs failures.
good luck
nice car rust free, you very lucky.
but Ill list top ones, most.
that low, would be gross misfiring , i sure you can hear that.
bad spark?
or egr valve stuck open
dis you scan it first? OBD2 scan tool works here, any made. works, then to now, USA.
id not hot wire that ISC, even with 14ohm coils 14watts there is going to get too hot. you can clean it and the EGR, that is electric EGR too.
when the RPm drops
just move the right foot a tiny bit, idle up now, (easy ,hard or impossible)
easy, ISC
hard, EGR
impossible , fuel starvation.
id use a scan tool and look for any DTCs set, running, some own set until 2 trips. but you can watch live data, and see what works and not.
im sure it has P300s (or p030x codes) misfire. but what else? or is it only 1cylinder that misfire, check pendings for early DTCs failures.
good luck
nice car rust free, you very lucky.
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