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View Full Version : Engine refuses to rev past 4200rpm


properjobb
04-25-2005, 12:33 PM
I'm having problems with my 1998 240 V6 sport. It revs up to 4200rpm fine, then just miss fires like it hits the rev limiter, some times it will make it to 5000rpm. I've checked all the plugs and they look fine and all the same colour. Any suggestions to what I should try next ?
Dr.Drew
04-25-2005, 01:48 PM
are you doing this in park ? or drive ?
properjobb
04-25-2005, 02:03 PM
Park, drive and neutral
Dr.Drew
04-25-2005, 03:45 PM
park and neutral have rev limiters
vbrock1137
04-25-2005, 03:51 PM
Neutral will rev to redline above 5 or 10 mph, on mine anyway.
Pagz
04-25-2005, 05:42 PM
definatly test ignition leads...

Rgrds,
Paul
coolcarlskic43
04-25-2005, 07:33 PM
Could be the air mass sensor.They are known to go bad!
Eiknujrac
04-25-2005, 08:15 PM
Park has a rev limiter around that RPM range, scared me the first time too ;)
jnenad16
04-25-2005, 09:04 PM
check ignition cables. you might have a spark "leak". also the fuel filter might be clogged.

nenad
mXm
04-26-2005, 09:57 PM
I'd try the fuel filter. Happened to me on my old Pontiac Parisienne, everytime I would hit the gas, at high rpm my engine would miss fuel and that gave the car a good shake sometimes.

If your rpm simply stops at 4200 then its most likely not gonna be that.
properjobb
04-27-2005, 09:31 AM
Talking to a local Merc technician he told me to take it for a drive with the mas unpluged, and guess what, it red lined no problem. Anyone know a bosch supplier at discount prices in the UK?
properjobb
04-28-2005, 11:46 AM
Just to let you all know in case anyone has similar trouble, I replaced the MAS today and my problems are solved. Thanx all for your input.
coolcarlskic43
04-28-2005, 12:40 PM
Originally posted by properjobb
Just to let you all know in case anyone has similar trouble, I replaced the MAS today and my problems are solved. Thanx all for your input. I told YOU!!!!!;) :D
wompwomp61
05-05-2005, 03:40 PM
Originally posted by properjobb
Just to let you all know in case anyone has similar trouble, I replaced the MAS today and my problems are solved. Thanx all for your input.


how much did that run you??
coolcarlskic43
05-05-2005, 07:52 PM
Originally posted by wompwomp61
how much did that run you?? You can get them on ebay for as cheap as 160.00.Dealer 200.00-250.00
properjobb
05-05-2005, 10:37 PM
I paid £185 inc tax from a company called Central Auto Supplies.