Misfure under cruise
Recently I've been having odd misfire issues. My car is a 1990 w/ 1.6L and MS1. Running Toyota COPS set a 2.5ms. It's for the most part only under med cruise, and tip in from med cruise to WOT. It's like a hesitation/misfire.
I've tested all my coilpacks and they are all well within spec. The plugs are gapped at .040. Car runs at 11.2/11.5:1 under WOT. |
Would you happen to have a log of the event occurring?
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Hrmm... not. But I can go drive around tommorow with my laptop. Main proplem here is my laptop is piece of shit that needs to be plugged in at all times.
I read your thread about the COPS, but not sure if it's the same thing? There was zero misfire for the first 3 months when the car was turbo'd. I raced it and everything. Not a hiccup. No all of a sudden it's happening all the time. |
Ok this is progressively getting worse. I did the 2.5MS to 3.0MS adjustment and it seemed to help... until the track day today. The car runs like shit. WOT in any gear above 4kRPM the engine mis-fires every few seconds... and sometimes a few every second.
I'm going to go log it tommorow. What setting should I log? I'm pretty n00b at this MS stuff and want to make sure I get the right info. The f'd thing about it, is it didn't do it for a good 4-5 months... all that time I was tracking the car and driving it hard. I don't know what changed. |
Could the fact that I'm running a turbo map on an N/A car right now have somethign to do with it? Running super rich/can't spark the fuel?
I popped the turbo off a while ago and have just been driving around with the same map. BUT, if I remeber right it was just starting to do the same thing when it was turbo as well. |
have you inspected your plugs?
Not unknown for them to require re-gapping. |
Yes I have. I changed plugs and brought the gap down to .030. it seemed to fix the problem until about a week later and it started again. perhaps they are getting too wet and having a hard time firing?
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If the car is N/A then 11.5:1 is just wasting gas. Target 13:1 at 100 kPa. Not sure that will cure the misfire though. I mean, the OEM ECU is reported to run pig rich at WOT above 4000 rpm too and stock cars don't normally have misfire issues due to the AFR.
Perhaps you have a COP going south? My laptop also requires constant plug-in power to keep from dying. Get on ebay and spend $15 for a cigarette plug adapter. Ending that grief was definitely worth a few bucks, and that solution will no doubt be cheaper than a new laptop battery. |
Lol.. my laptop just sucks. I need a new one.
Aside from that... I could have a COP going south. It's gotten really bad lately. How can I test them? I just want to make sure I did it right? They have a warranty. I bought them at a wrecker. And as for the AFR... a new engine is going in soon so I'm not spending time on the dyno to get this one tuned. |
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