No spark wont start

SOURCE: my car will turn over

also your car may need a timing belt change

SOURCE: no start

get a can of quick start and try it. did it backfire or anything like that. check the oil as well and see what colour it is.

david mcclellan

• 530 Answers
• Posted on Oct 21, 2009

SOURCE: my 1984 ford f-150 turns over,but wont start,it

There are a few things you can still check to locate the weak spark issue.

The first is the battery. you should have it tested. If it's showing a low voltage this may or may not be because the battery is bad. You need to consider the age of the battery first. & years is about the life of the average auto battery. If it's newer then that the alternator and or the wires could be the cause.

Inspect the battery cables and alternator wiring.
The cables and terminals should be cleaned and a little Vaseline applied to combat corrosion. All the wiring in the starting circuit should be inspected for loose or damaged connectors and corrosion. Also look for any wear or kinks in the wire covering. A thin spot on a wire can bleed off voltage and interrupt the signal. Get a can of Dielectric grease and spray the inside of all the connectors.

You replace most of the ignition components but how about the ignition control module. Although when the control module goes bad the symptom is usually no spark but it can affect the coil's performance resulting in weak spark also. Before replacing the control module disconnect all the terminals and check and clean any corrosion you find. Apply some Dielectric grease spray and reconnect and check your spark.

More then likely following these steps will take care of the problem.
If after you have checked everything here and the problem persists please respond with all you checked and any results and I'll try and help narrow the trouble down.
Hope this helps.

SOURCE: NO SPARK PLUG FIRE,CHANGE DISTRIBUTOR CAP AND

Check the coil out with an ohm meter. Auto Zone has Haynes Manuals with all the answers for your truck. I would get one if you plan to keep your truck for awhile

SOURCE: vehicle came in for check

A misfire at idle that smooths out at cruise is ALMOST ALWAYS caused by a vacuum leak. Take a hard look at your fuel trims at idle. If the Bank 2 Long Term Fuel Trim is more than + a couple points higher than the Bank 1 trim, your problem is most likely a vacuum leak. If the Fuel Trims even-out while holding the engine at 2000 RPM for about 20 seconds, then a vacuum leak is DEFINITELY your problem. I would suspect a leaking lower intake gasket leak because an upper plenum leak will normally affect all cylinders.