EMI (electro magnetic interference)
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EMI (electro magnetic interference)
Haven't had a chance to really work on the car yet....
But I just started thinking about something (a long shot to be sure): Electromagnetic Interference
I found that I had to shield my Romulator-to-ECM interface cable to make it work. I also get some "popping" noises coming through my speakers (even with the radio off) that sound almost like the ignition coil firing off. The question is has anyone experienced anything like this? I've replaced the little capacitor in the distributor a couple of times already and I plan to put some dielectric grease on the distributor cap terminals. If these things don't cure the EMI, then what else could I attack? The EMI is obviously a problem for other things (even if it's not affecting the ECM), so I want to cure it anyway.
But I just started thinking about something (a long shot to be sure): Electromagnetic Interference
I found that I had to shield my Romulator-to-ECM interface cable to make it work. I also get some "popping" noises coming through my speakers (even with the radio off) that sound almost like the ignition coil firing off. The question is has anyone experienced anything like this? I've replaced the little capacitor in the distributor a couple of times already and I plan to put some dielectric grease on the distributor cap terminals. If these things don't cure the EMI, then what else could I attack? The EMI is obviously a problem for other things (even if it's not affecting the ECM), so I want to cure it anyway.
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From: San Lorenzo, California
Car: 1987 Firebird Trans AM
Engine: 383 TPI...very soon
Transmission: TH700R4
What kind of spark plug wires do you have? I switched over to Accel Super Stock wires a long time back, and I noticed that I had a lot of interference on the radio (lots of pop and hiss), I never had that with my stock style wires (autolite I believe they were).
I think a spiral core wire is the ticket (I will find out when I get my new engine in)
I think a spiral core wire is the ticket (I will find out when I get my new engine in)
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I'm running Delco plug wires. Matter of fact, they're the exact wires that the L98 TPI Vettes run. I just ohmed them out about 10 minutes ago too. They ranged from 7 kOhm on the shortest wire to 12 kOhm on the longest. Seems pretty good to me.
I also ran another test: Took an AM radio with a set of headphones, set it to a blank station (made sure there was no static with it away from the car on that station) , and started to wave it around the engine bay. IT was really noisy around the alternator, distributor, the wires, the plugs. I could hear the popping from the ignition along with a lot of other static. THen I put it inside the car and waved around the ECM area. Wasn't as bad, but I could definitely hear static and popping. Wonder if the ECM is picking any of this stuff up....
I also ran another test: Took an AM radio with a set of headphones, set it to a blank station (made sure there was no static with it away from the car on that station) , and started to wave it around the engine bay. IT was really noisy around the alternator, distributor, the wires, the plugs. I could hear the popping from the ignition along with a lot of other static. THen I put it inside the car and waved around the ECM area. Wasn't as bad, but I could definitely hear static and popping. Wonder if the ECM is picking any of this stuff up....
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Resistor plugs, too?
How about the capacitor in the alternator?
You can safely install a 20WVDC electrolytic in about any circuit you want, except for the injector (switching side) circuit. About 47µf or so should do it.
How about the capacitor in the alternator?
You can safely install a 20WVDC electrolytic in about any circuit you want, except for the injector (switching side) circuit. About 47µf or so should do it.
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Originally posted by Vader
Resistor plugs, too?
How about the capacitor in the alternator?
You can safely install a 20WVDC electrolytic in about any circuit you want, except for the injector (switching side) circuit. About 47µf or so should do it.
Resistor plugs, too?
How about the capacitor in the alternator?
You can safely install a 20WVDC electrolytic in about any circuit you want, except for the injector (switching side) circuit. About 47µf or so should do it.
Not sure about the cap in the alternator, though I have had it checked out at the local parts house.
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