slow pick up and cats get super hot

pgcan · 09-22-2011, 04:07 PM

Hello all
here is what i have my car was running fine then all of a sudden she lost pick up it runs like it has a stopped up nose, it is hard to explain, but it does not run smooth like it should, one said that my cats were cloged up so i changed them still same problem come to find out my cats were fine, but when the shop was cutting the old ones off there was raw fuel in the pipes so that is saying that she is running rich, i dont know where to look iam getting to my wits end with this car,

i have changed the wire harness the dist caps and rotors the coils
this problem started a couple of days after i changed the dist and rotors

any body have had this problem
or any help

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lcmlee · 09-22-2011, 08:51 PM

check Mass Air Flow sensor

oldsinner111 · 09-24-2011, 07:57 AM

Did you use new ignition wires? That maybe your problem with old wires.

pgcan · 09-24-2011, 08:44 AM

No i did not put new wires on but one thing i notcied was that it is running rich
and there is a bad fuel smell and that it is burning a lot of fuel i cant drive the car there was raw fuel in the pipes Iam wondering if it could be my fuel pressure regalator, the car runs like it is stoped up

iam thinking there is a fuel problem

oldsinner111 · 09-24-2011, 01:50 PM

Well Sir it could be fouled plugs,you can at least pull plugs to see which are not firing.Then you know if its wires or coil boots.You can buy mass airflow cleaner.A dirty air flow sensor can give you all kind of problems.

MOREN19241 · 10-24-2011, 01:26 AM

I AM HAVING THE SAME PROBLEM WITH MY 95 S420,I REPLACED THE WIRING HARNESS WHICH WAS BAD,CRACKED INSULATION,AND ALSO REPLACED AIR MASS FLOW SENSOR.BUT NOTHING CHANGED,NO PICK UP ON ACCELERATION,RUNS RICH!!!
I DONT KNOW WHAT ELSE TO DO!!!

pgcan · 10-24-2011, 09:10 AM

after all i done i it was one of my coils had burnt

MOREN19241 · 10-24-2011, 10:54 AM

Thanks,I will have to check that and see if it takes care of my problem....

09-24-2011, 07:57 AM	#3
oldsinner111 Senior Member 1999 Mercedes-Benz S-Class Join Date: Jun 2010 Location: tennessee Posts: 494 Drives: s320 and 300sd	Did you use new ignition wires? That maybe your problem with old wires. __________________ 1999 S320 plus 125 nitrous shot hp,modified grille area,and cold air intake,wrapped exhaust manifold,wrapped air duct,cold air,ceramic pads,no cats Borla exhaust one muffler14.4 1/4 mile 1983 300 SD not stock Mobil One ATF diesel rated oil both cars

09-24-2011, 01:50 PM	#5
oldsinner111 Senior Member 1999 Mercedes-Benz S-Class Join Date: Jun 2010 Location: tennessee Posts: 494 Drives: s320 and 300sd	Well Sir it could be fouled plugs,you can at least pull plugs to see which are not firing.Then you know if its wires or coil boots.You can buy mass airflow cleaner.A dirty air flow sensor can give you all kind of problems. __________________ 1999 S320 plus 125 nitrous shot hp,modified grille area,and cold air intake,wrapped exhaust manifold,wrapped air duct,cold air,ceramic pads,no cats Borla exhaust one muffler14.4 1/4 mile 1983 300 SD not stock Mobil One ATF diesel rated oil both cars Last edited by oldsinner111; 09-25-2011 at 08:23 AM.

10-24-2011, 09:10 AM	#7
pgcan Newbie Garage is empty, add now Join Date: Jan 2011 Posts: 11 Drives: 1995 S 420	problem fixed after all i done i it was one of my coils had burnt

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09-22-2011, 08:51 PM	#2
lcmlee Newbie 1993 Mercedes-Benz 420-Class Join Date: May 2011 Location: Unionville, Ontario Posts: 12 Drives: 400 SEL	check Mass Air Flow sensor

09-24-2011, 08:44 AM	#4
pgcan Newbie Garage is empty, add now Join Date: Jan 2011 Posts: 11 Drives: 1995 S 420	No i did not put new wires on but one thing i notcied was that it is running rich and there is a bad fuel smell and that it is burning a lot of fuel i cant drive the car there was raw fuel in the pipes Iam wondering if it could be my fuel pressure regalator, the car runs like it is stoped up iam thinking there is a fuel problem

10-24-2011, 01:26 AM	#6
MOREN19241 Newbie Garage is empty, add now Join Date: Oct 2011 Posts: 5 Drives: 2000 S 500 MERCEDES BNZ	I AM HAVING THE SAME PROBLEM WITH MY 95 S420,I REPLACED THE WIRING HARNESS WHICH WAS BAD,CRACKED INSULATION,AND ALSO REPLACED AIR MASS FLOW SENSOR.BUT NOTHING CHANGED,NO PICK UP ON ACCELERATION,RUNS RICH!!! I DONT KNOW WHAT ELSE TO DO!!!

10-24-2011, 10:54 AM	#8
MOREN19241 Newbie Garage is empty, add now Join Date: Oct 2011 Posts: 5 Drives: 2000 S 500 MERCEDES BNZ	Thanks,I will have to check that and see if it takes care of my problem....

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