Car starts and runs as soon as I hit the throttle it dies??

Asked by Jul 23, 2015 at 12:46 AM about the 1986 Mercedes-Benz 420-Class

Question type: Maintenance & Repair

Hi all, my father has a 1986 420sel he
has just fitted another engine to it.
It is a 500 engine but the problem is
as soon as you hit the throttle it dies.
It will idle ok can any body help us
please?
Thanks luke

1 Answer

260

Most likely it is your ignition coil or spark plug wire. Where these replaced when the newer engine installed? If not that could be the culprit. If they were check your fuel pump, cable battery connection, ignition control module, and the crankshaft Position Sensor. Let me know if that helps.

Your Answer

Add photo

Related Questions

Search Mercedes-Benz 420-Class Questions

Mercedes-Benz 420-Class Experts

#1 BoholMark
BoholMark
Reputation 60
#2 Habib Sherdil
Habib Sherdil
Reputation 50
#2 importguy
importguy
Reputation 50
View All

Related Models For Sale

Used BMW 7 Series
170 Great Deals out of 6,132 listings starting at $2,999
Used Chevrolet Camaro
205 Great Deals out of 30,804 listings starting at $1,217
Used Mercedes-Benz SL-Class
36 Great Deals out of 2,858 listings starting at $3,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.