A couple of weeks ago I performed a home compression test on my 325eta, put everything back where I found it, and immediately since I experienced these problems I've never had before:
-RPMs will drop to 0 at idle occasionally, will never die if I give it gas.
-Occasional chunky / choking sound at idle (no throttle): it sounds as uncomfortable as an M20 with a crazy cam. Sometimes it flips the switch and idles inaudibly at 800 rpm.
-Will misfire and lag at low RPMs in 1st. It's strange, it holds back almost all of its power with a fast blipping noise when it happens.
What bothers me is that this happened immediately after the compression test and feels very clear that it caused these issues. I wouldn't put it past clogged injectors / fuel filter, and fuel pressure is low, but I don't think those are the most likely causes.
It has-
New cap / rotor / plugs, gapped plugs to .028 inch. Torque may be suspect but felt similar to the previous setting.
Tried multiple ECUs- one stock new one w/ Mark D chip misfires a bit more but runs better outside of that.
It ran very smoothly before most of the time, outside of alternating between closed and open loop. Potential issues not mentioned so far are a pretty beat up conical air filter, intake manifold funny spot that looks like it was welded over or something. Coolant temp sensor gives me jumpy readings. One of the spark plug threads is painfully beat up. Compression is 5 180's and 1 150 but didn't seem to ruin anything before.
I've tried unplugging and plugging back in the wires. Where should I start from here? I have plenty of time as it's not needed for transportation and I'm ok with taking it easy until I save up for a full rebuild. Would feel amazing to get it running smoothly again and drive it everywhere though. The other family's 80s box (8v 190e) is having a similar issue and that would be fun to put in the past too.
Thanks!
-RPMs will drop to 0 at idle occasionally, will never die if I give it gas.
-Occasional chunky / choking sound at idle (no throttle): it sounds as uncomfortable as an M20 with a crazy cam. Sometimes it flips the switch and idles inaudibly at 800 rpm.
-Will misfire and lag at low RPMs in 1st. It's strange, it holds back almost all of its power with a fast blipping noise when it happens.
What bothers me is that this happened immediately after the compression test and feels very clear that it caused these issues. I wouldn't put it past clogged injectors / fuel filter, and fuel pressure is low, but I don't think those are the most likely causes.
It has-
New cap / rotor / plugs, gapped plugs to .028 inch. Torque may be suspect but felt similar to the previous setting.
Tried multiple ECUs- one stock new one w/ Mark D chip misfires a bit more but runs better outside of that.
It ran very smoothly before most of the time, outside of alternating between closed and open loop. Potential issues not mentioned so far are a pretty beat up conical air filter, intake manifold funny spot that looks like it was welded over or something. Coolant temp sensor gives me jumpy readings. One of the spark plug threads is painfully beat up. Compression is 5 180's and 1 150 but didn't seem to ruin anything before.
I've tried unplugging and plugging back in the wires. Where should I start from here? I have plenty of time as it's not needed for transportation and I'm ok with taking it easy until I save up for a full rebuild. Would feel amazing to get it running smoothly again and drive it everywhere though. The other family's 80s box (8v 190e) is having a similar issue and that would be fun to put in the past too.
Thanks!
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