6 replies to this topic

[jcmiggs]

Have a 99 Challenger 1800 with twin 787's. Just started having a problem with the starboard engine. At around 5200 rpm it starts to surge with RPM's falling back to 4000 then surging back and forth. Runs fine at 5k, just anytime it is pushed beyond that it falls off. Currently need to feather it to keep it there, punching it past 5200-5500 it will somtimes shutdown after surging a couple of times. Plugs look fine, scratching head on Raves, electrical, or fuel...


No problems on the port side.

Any thoughts would be appreciated.

[Kevin Leclair]

Have you taken it to the dealer to let them run any diagnostics on it?

[adventurer]

Hi there!!

I have a 98 1800,just last week I solve the same problem in my boat,after 5 minutes or less running fine the right engine started to surge like yours. the engine wont rev more than 4000 to 4500 rpms and if forced up it will shut off. it was driving me crazy as it only can be tested in the water. so I started changing parts like coils, then regulators from one engine to the other with no luck. finally we discovered that moving the plug on top of the small electrical box the engine started to work ok for a moment then fail again. so back home I took out the plug at the end of the cable side apart to discover a corroed terminal on the 12v cable(the red one)that was causing all the problem,this terminals are designed so it can be disassembled easely by removing the front and back covers so you can take the cables out if necesary. I also took the plug on top of the box out and cleaned it also,you just need to clean all the terminals with contac cleaner and a small wire brush and use dielectric grease on all the terminals to be sure it wont happen again.finally do the same on the other engine as a preventive maintenance. hope you can solve the problem!!

Abdin

[jcmiggs]

Hi there!!

I have a 98 1800,just last week I solve the same problem in my boat,after 5 minutes or less running fine the right engine started to surge like yours. the engine wont rev more than 4000 to 4500 rpms and if forced up it will shut off. it was driving me crazy as it only can be tested in the water. so I started changing parts like coils, then regulators from one engine to the other with no luck. finally we discovered that moving the plug on top of the small electrical box the engine started to work ok for a moment then fail again. so back home I took out the plug at the end of the cable side apart to discover a corroed terminal on the 12v cable(the red one)that was causing all the problem,this terminals are designed so it can be disassembled easely by removing the front and back covers so you can take the cables out if necesary. I also took the plug on top of the box out and cleaned it also,you just need to clean all the terminals with contac cleaner and a small wire brush and use dielectric grease on all the terminals to be sure it wont happen again.finally do the same on the other engine as a preventive maintenance. hope you can solve the problem!!

Abdin

Sounds like a very similar issue. Which small electrical box are you referring to? Are you referring to the multi-pin AMP connectors on the MPEM? A photo would be helpful.

Thanks in advance
Joe

[jcmiggs]

Sounds like a very similar issue. Which small electrical box are you referring to? Are you referring to the multi-pin AMP connectors on the MPEM? A photo would be helpful.

Thanks in advance
Joe

Thanks for the advice....took all connectors apart and cleaned them. Figured I would change out fuel filters as well. Running great. No more surging or cut out. Filters flowed well, so I am suspecting it was the electrical connections as advised above. Thanks

[Kevin Leclair]

Great news, thanks for the update.

[adventurer]

 Lmr98v1a.pdf - Adobe Reader.bmp   1.14MB   89 downloads

HI Joe!!

Its great news,Im glad you solved the problem, sorry for the late response but my modem fried and was without interned a week and a half as had to wait for my DSL company to send a replacement one. I tried to send you a photo but your email site treated it as junk mail and was sent back to me as undeliverable.just in case anybody else has the same probem I have attached a photo showing the plug that most be checked for bad contacts, make sure to clean both the cable end connector and the female connector on top of the box and to do the same to the other engine to prevent
this problem in the future....

thanks!!

Abdin