I just bought a minty 89 420SEL and the only things I can find to look at are as follows:

1. A/C is a little slow to come on after the switch is pushed; works fine after that .... has been converted to 134A

2. Security alarm is very sensitive; seems to be affected by heavy wind, etc. etc. occasionally. Can this system be adjusted to be less sensitive?

3. A slightly rough idle; higher speed performance and starting are fine? I will look at the obvious -- such as vac hoses and plug connections, but what else might cause this?

Would appreciate any thoughts on these items .... thanks, Ben Carter

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Ben Harrison Carter
1999 Mercedes ML320 87K
1992 Mercedes 300CE 89K
1995 Corvette 29K -- Sold Dec 09
1989 Mercedes 420SEL 99K -- (Sold 4/08)
1968 Mercedes 230S (106K) (Sold 9/06))
1976 Mercedes 450SEL 130K (Just sold - 06)
1961 Mercedes 220Sb (sold years ago)