volvo 740 turbo staring ISSUE!!!

Thread Tools
 
Search this Thread
 
Old Sep 1, 2018 | 10:53 PM
  #1  
Clarke Wayde's Avatar
Thread Starter
|
Junior Member
Joined: Sep 2018
Posts: 3
Likes: 0
Exclamation volvo 740 turbo staring ISSUE!!!


HEY TEAM, IM CURRENTLY HAVING PROBLEMS WITH SPARK .
BACKGROUND: I BROUGHT THE CAR NOT RUNNING THAT WAS ALL OKAY THE ISSUE WAS THE RADIO SUPPRESSION RELAY THE RELAY ITSELF AND THE WIRING WAS ALL UGLY ETC SO I DECIDED TO BYPASS IT ( YES,BYPASSED) AND IT RAN NICELY FOR AROUND 2 WEEKS . I PULL UP TO THE GAS STATION AND IT STOPPED AND WONT START . ITS NOW BEEN 6 MONTHS SINCE OFF THE ROAD , SHES CRANKING OVER BUT HAS 100% NO SPARK , THE DISTRIBUTOR HAS BEEN NEWLY REPLACED AND UNDER 1 YEAR OLD , BUT I HAVE NOTICED THE HALL SENSOR PLUG IS QUITE LOOSE??. AND BEFORE YOU ASK IF I WAS RUNNING THE BLOW OF VALVE WHILE CAR WAS RUNNING THE ANSWER IS NO IVE ONLY JUST PUT IT ON THERE . ALSO I HAVE TESTED THE COIL AND ITS GIVING SPARK . PLEASE ANY INFORMATION WOULD BE APPRECIATED LET ME KNOW IF IVE MISSED ANY SORT OF INFO OUT THANKS
 
Reply
Old Sep 2, 2018 | 07:53 PM
  #2  
lev's Avatar
lev
Senior Member
Joined: Oct 2010
Posts: 4,540
Likes: 137
Default

The Hall sensor may likely be the issue, look into that.
 
Reply
Old Sep 2, 2018 | 09:48 PM
  #3  
Clarke Wayde's Avatar
Thread Starter
|
Junior Member
Joined: Sep 2018
Posts: 3
Likes: 0
Default

thanks for the reply lev , how do i check the hall sensor, also the plug has alot of play is what i was meant to say lol
 
Reply
Old Sep 3, 2018 | 09:38 AM
  #4  
lev's Avatar
lev
Senior Member
Joined: Oct 2010
Posts: 4,540
Likes: 137
Default

Quick Hall sensor test: the tachometer needle does jump slighty as you crank engine over if the Hall sensor is working, but the needle lays dead if the sensor is not working.Full Hall Sensor Test: Undo the distributor connector. When the ignition is ON the Voltage between positive terminal (red lead -Nr. 3) and ground should be approx. 11V. Voltage between (blue lead - Nr.2; middle one) and ground should be 5V although if you put it on a scope you would see the sharp rise and fall from 12v to ground as the distributor rotates. Pulse frequency varies as rpm is increased. . Resistance between (black lead - Nr. 1) and ground should be close to zero Ohms. Undo connector from the control unit (above the brake pedal) and remove the sealing washers (plastic inserts on the side of the connector). Replace connector without cover or sealing washers.- Disconnect the/red and blue leads from ignition coil. - Measure voltage between terminal 24 at rear of control unit connector (blue lead) and ground. NOTE: Connector must be attached to control unit. Switch on ignition. Turn crankshaft by hand. Voltage should indicate OVER 1.8V each time a vane passes Hall generator. Instrument should read approx."0" (0 - 0.7V) each time an opening passes Hall generator. The correct voltage is less than 0.7V or more than 1.8V.
 
Reply
Old Sep 4, 2018 | 07:14 AM
  #5  
Clarke Wayde's Avatar
Thread Starter
|
Junior Member
Joined: Sep 2018
Posts: 3
Likes: 0
Default

okay i've done that. the rpm needle is jumping fine, checked my coil today it had really good spark so thats okay , spark plugs have really weak spark so i called into a local auto sparky and asked him , he said its the rotor from dizzy causing the weak spark so ive ordered a new one and pick it up tomorrow . he was saying if the coil is good then its sending good spark to distributor but the rotor isnt sending out the correct spark across the spark plugs ??hope this sounds right we will soon find out...
 
Reply
Old Sep 5, 2018 | 02:52 AM
  #6  
pierce's Avatar
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
Default

that bright blue stuff ain't stock, someone has been tampering with this thing.
 
Reply
Old Sep 5, 2018 | 02:53 AM
  #7  
pierce's Avatar
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
Default

you said you replaced the distributor, so presumably it already has a new cap, rotor, and insulator disk in it, and a new hall sensor ??
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
woodenyouknowit
Volvo 240, 740 & 940
3
May 16, 2018 12:57 PM
kmcghee
Volvo 240, 740 & 940
6
Apr 7, 2017 01:18 PM
bretbretterson
Volvo 240, 740 & 940
2
Jul 25, 2014 02:10 PM
Bumblebeeman
Volvo 240, 740 & 940
12
Nov 4, 2012 07:27 PM
Hypnopirate
Volvo 850
7
Jul 4, 2012 07:34 PM




All times are GMT -5. The time now is 07:57 PM.