radredrocketer

Starts and runs great when the outside temp is below about 90, but when it gets hot out, the engine just cranks and won't fire. I did have success once by loosening the gas cap, but that hasn't worked lately. Seems like the problem is getting worse, like last year it had this problem when it was around 100. Anyone experienced this? I appreciate any thoughts/comments.
thanks in advance.

radredrocketer

forgot to mention, 2001 cls

mattcl-s

Replace the main relay. I had the same problem in the summer months it would only start after it would cool down common problem easy fix

radredrocketer

thanks for the reply Mattcl-s. do you mean you had the same problem even when the engine was cool, but the outside air was hot?
thanks again.

3.2cls6speedmt

Common problem on Hondas. Very easy fix. It is the main relay.

musiclevelz5

It could be the main relay but not always. The main relay is the easiest and cheapest to start with. After that and it still has the same problem let us know. I can help go through other fixes.

radredrocketer

Thanks to all who replied. I'll replace the main relay and hopefully problem will disappear.

Danzig54

I have a similar issue. car runs fine but then it just stalls. sometimes it fires right back , but sometimes I have to wait a few minutes .any thoughts?

nishant11

Very well known issue with quality of main relay contacts. I donot know why it is not covered under a recall with such a high failure rate reported.

Issue seems to have been fixed from 2003 cars

Flexing my musCL-S

Jesus, the main relay not working in hot (and sunny w/windows rolled up) weather is a problem that goes back to the DA/EF era. Used to have to remove mine and bring it in to my work locker on hot days. Hopefully they eventually solved this aggravating and common issue.

Danzig54

Replaced main relay with part from Advance Auto Parts. Got tired of car stalling, so I got it and replaced it in the parking lot. So far, so good. I think it was a BWD part # R4819. One suggestion, if you remove the bolt holding the bracket to get to it, you will have to take the plug out of the stoplight switch to make it somewhat easier to replace. Hopefully I wont have to do that again anytime soon.

Tosh

https://acurazine.com/forums/2g-cl-p.../#post16266584

It's so common that I wrote a song about it.

panhandle

What does main relay do? With reference to starting? Newb here.