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'86 740 B230F LH - EZK won't start[740-760/86] posted by Harvey Smith on
Thursday, 25 June 1998, at 9:27 p.m.
Update, still dead :( Owner frustrated ... any more ideas guys?
Engine will not start -- I've:
1) replaced plugs, wires, distributor cap, and rotor
2) cleaned injectors, put in new "o" rings
3) repaired frayed insulation on some wiring
4) replaced fuel filter
5) cleaned and inspected MAF (platinum wire still intact)
6) checked all fuses
7) all vacuum lines appear to be connected and intact
Checked for fuel coming out of injectors (not really a mist or spray but more like pencil thin jet of gas from center of all injectors)
Ignition observed off of plug wire near ground seemed to be more of a yellow arc but a heavy arc indeed.
Just fyi, picked up CD from local Auto Zone store about $17 bucks has alot of info. Is produced by Popular Mechanics and ALLDATA. Seems like a great troubleshooting aid ... I am getting tired of reading thru it so any ideas or comments welcomed. Many thanks, Harv
--Harv Smith
Re: '86 740 B230F LH - EZK won't start[740-760/86] posted by Steve Seekins on
Monday, 29 June 1998, at 3:07 p.m.
First, 'pencil thin jets' indicate a definite fuel problem - either severely worn or clogged injectors, or poor fuel pressure. The injector should spray a fine cone shaped spray - almost a mist. Take the injectors out and have professionally cleaned or replace them. Check fuel pressure regulator - use a gage. Remember that the fuel pressure should vary with manifold vacuum on a 1:1 ratio. Spark may look OK, but you can really only tell with an O-Scope whether there is sufficient voltage. Also, you need to check spark plugs, not just the wire end.
In the presence of fuel, air, and spark, timing is everything! Check to make sure that all plugs get spark at the correct timing - a couple of wires cross-firing in the distributor will ruin everything - at least it won't start - same goes for sparks at the wrong time - did you check timing belt - not only condition, but to be sure that crank, cam and idler shaft are properly synchronized. It is also good to check to make sure that the fuel pumps run properly and don't cut out as soon as the starter is released. Based on what you say - I would suspect that you have a number of problems that have piled up - solving any one or two may not get it running - I recommend that you have it in for a thorough go through and diagnostic service - get it completely fixed, then keep up with the maintenance - when things come due, make sure they are taken care of. Volvos have a reputation of taking a lot of abuse and neglect while continuing to run, however, eventually there is a straw that breakes the camel's back, then you need to get everything fixed before you can get going again.
Steve Seekins,