Peer81
Well-known member
Hello everybody,
Last week I was testing the E4ME with my dual A/F ratio meter. Everything was great with under normal idle and light accelerations numbers between 15 – 16:1 (14.7:1 is the ideal but can be leaned out to 17:1 under minimal load conditions). Under full throttle it was going between 12 – 13:1 (to be save 12.5:1 is best). So I was very happy. But now the problem. When testing my lock-up (see different topic in tech. The carb was loading up getting down to 6:1 almost stalling the engine. But driving in second gear the way home, high in the rpm I could get her going. I was thinking about something inside the fuel bowl so there was to much fuel coming in the carb.
But at home the thing changed around. No longer a rich problem but a very lean problem around 20:1 on both cylinder banks. I also hooked up the dwell meter and that thing also showed a very lean condition. I visually checked for vacuum leaks but didn’t find any and with the vacuum meter attached I got a healthy 15 – 18HG around 800rpm. I check the TPS but it was nice at 0.56v, I put the ignition back at factory 6 degrees BTDC. When placing my hand above the choke valve the rpm started climbing, better idle and the dwell got back round the normal 30 degrees. I can’t say I’m missing some cylinders because the problem is left and right. And with my hand on the choke valve the idle is smooth. Turning the engine off and on again the engine starts nice also around 15:1 and 30 degrees dwell but is within 10 seconds to fall back into full lean. No service engine lights and other problems I can think off. Maybe my ECM is on its way to heaven?
I hope somebody has an idea where to look for this problem.
Greetings Peter
Last week I was testing the E4ME with my dual A/F ratio meter. Everything was great with under normal idle and light accelerations numbers between 15 – 16:1 (14.7:1 is the ideal but can be leaned out to 17:1 under minimal load conditions). Under full throttle it was going between 12 – 13:1 (to be save 12.5:1 is best). So I was very happy. But now the problem. When testing my lock-up (see different topic in tech. The carb was loading up getting down to 6:1 almost stalling the engine. But driving in second gear the way home, high in the rpm I could get her going. I was thinking about something inside the fuel bowl so there was to much fuel coming in the carb.
But at home the thing changed around. No longer a rich problem but a very lean problem around 20:1 on both cylinder banks. I also hooked up the dwell meter and that thing also showed a very lean condition. I visually checked for vacuum leaks but didn’t find any and with the vacuum meter attached I got a healthy 15 – 18HG around 800rpm. I check the TPS but it was nice at 0.56v, I put the ignition back at factory 6 degrees BTDC. When placing my hand above the choke valve the rpm started climbing, better idle and the dwell got back round the normal 30 degrees. I can’t say I’m missing some cylinders because the problem is left and right. And with my hand on the choke valve the idle is smooth. Turning the engine off and on again the engine starts nice also around 15:1 and 30 degrees dwell but is within 10 seconds to fall back into full lean. No service engine lights and other problems I can think off. Maybe my ECM is on its way to heaven?
I hope somebody has an idea where to look for this problem.
Greetings Peter