 Spark plugs and tea leaves, reading 'em |
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| Porschef |
 Feb 23 2012, 11:00 AM
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#1
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How you doin'  Group: Members Posts: 2,165 Joined: 7-September 10 From: LawnGuyland Member No.: 12,152 Region Association: North East States 
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Got about 800 miles on these, pulled em out to open the gap with the Pertronix
install. How do these look to you? All four are essentially the same. Nevermind the tea leaves. Attached thumbnail(s)  Attached image(s) 
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| Porschef |
Feb 23 2012, 08:58 PM
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#2
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How you doin' Group: Members Posts: 2,165 Joined: 7-September 10 From: LawnGuyland Member No.: 12,152 Region Association: North East States
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I'm running Ljet. I haven't read the A/F ratio. I do get some light pinging under load. And I don't know how to enrich the mixture.
What now? |
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| ConeDodger |
Feb 23 2012, 09:14 PM
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#3
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Apex killer! Group: Members Posts: 23,606 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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QUOTE(Porschef @ Feb 23 2012, 06:58 PM)  I'm running Ljet. I haven't read the A/F ratio. I do get some light pinging under load. And I don't know how to enrich the mixture. What now? You don't necessarily need to enrich the mixture. (please understand, I am not saying you are or are not running lean. You don't know, and plug reading is an obsolete black art with the advent of unleaded fuel). Light pinging under load can be taken care of with a bit of timing change. If you really want to know what your A:F ratio is, you have to check it. I would guess though, that with all things running correctly, you have a pretty good A:F ratio. Properly operating LJet is taking care of that for you without adjustment. IIRC, there is only one 'adjustment' and it is on the AFM and is only intended to adjust for idle conditions. LJet uses TPS, CHT, and Air Flow to meter fuel. People have fooled with the spring tension in the AFM, put resistors in line with the CHT, etc. to try and get more 'performance' out of their LJet engine. Instead, I think they have gotten less driveability. Adjust your valves, check your timing, then go through the procedure outlined in the Bosch manual or it might even be in the FSM to check your LJet. Make sure your wiring is in good shape as the CHT uses a resistance signal, and the AFM and TPS use a position signal. If your wiring is bad your signal to the ECU will be garbage. Frankly though, if all you have is light pinging under load you are worlds ahead of the jackstand brigade around here. (IMG:style_emoticons/default/smile.gif) |
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Posts in this topic
Porschef Spark plugs and tea leaves Feb 23 2012, 11:00 AM
jmill Looks lean or plug is too hot.
Check this thread ... Feb 23 2012, 11:12 AM struckn They look Good, almost perfect. Feb 23 2012, 07:09 PM whatabout1 Very lean or hot. I don't like that little c... Feb 23 2012, 07:32 PM ConeDodger Reading plugs supposedly became inaccurate with th... Feb 23 2012, 08:22 PM
Cap'n Krusty
Reading plugs supposedly became inaccurate with t... Feb 23 2012, 08:48 PM Porschef Rob, thanks for the reply. The car runs good, and ... Feb 23 2012, 09:30 PM ConeDodger
Rob, thanks for the reply. The car runs good, and... Feb 23 2012, 10:11 PM Valy
Rob, thanks for the reply. The car runs good, and... Feb 24 2012, 01:15 AM Porschef It would start ok and then idle way too low until ... Feb 24 2012, 05:34 AM |
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