Why does left side of engine have weak spark?

Carlos Castellanos

Asked by Apr 03, 2016 at 06:46 PM about the 1993 Ford Mustang LX Convertible

Question type: Maintenance & Repair

Car has two coils and won't start

3 Answers


Intake coil maybe weak, but if the exhaust side is strong it should run if it is getting fuel, injector pulse and has compression.

Carlos Castellanos

Engine was running fine when it turned off so I assume compression should b good enuf to turn on. Engine cranks and kinda sounds like it's gonna turn on. I replaced the coil for weak side and nothing changed.I unplugged the fuel line and it has high pressure


get some starter fluid and spray some in the intake hose and see if it fires off briefly, if it does then you have a fuel problem, possibly something wrong in the injection circuit. If it doesn't then as you seem to have spark then the only thing it can be is the spark is out of time, possible crank sensor. HTH

Your Answer

Add photo

Related Questions

  • Why does left side of engine have weak spark? 2 answers

    1993 Ford Mustang LX Convertible


    Maintenance & Repair

  • Engine trouble :( 11 answers

    Hey guys, I'm New here so I'll try to keep this simple and maybe get some help. I'm no mechanic by far but growing up, I was a "daddy's girl" so I learned a few things about engines and how they ...

    1999 Ford Mustang STD Coupe


    Maintenance & Repair

  • Engine Tick 21 answers

    Recently, within the last month, i have noticed a constant tick-tick-tick coming from the engine bay. I already replaced the spark plugs, so it is not those. It sounds like a valve is ticking from w...

    2004 Ford Mustang


    Maintenance & Repair

  • spark plug gap 6 answers

    What is the spark plug gap recommended for the magna supercharger installation for the 2005 Mustang GT to prevent detonation? So far I have two different answers. From magna installation manual with ...

    2005 Ford Mustang GT Deluxe


    Maintenance & Repair

  • Slow cars 63 answers

    Why are Ford Mustangs slow?

    2007 Ford Mustang GT Deluxe




Looking for a Used Mustang in your area?

CarGurus has 41,499 nationwide Mustang listings starting at $900.


Search Ford Mustang Questions

Ford Mustang Experts

#1 Tom Demyan
Tom Demyan
Reputation 3,770
#2 FordNut
Reputation 1,220
#3 carGrrl
Reputation 890
View All

Related Models For Sale

Used Chevrolet Camaro"
826 Great Deals out of 39,073 listings starting at $2,650
Used Chevrolet Corvette"
436 Great Deals out of 20,335 listings starting at $3,688
Used Ford Mustang SVT Cobra"
5 Great Deals out of 318 listings starting at $5,999
Used Ford F-150"
3,259 Great Deals out of 217,203 listings starting at $1,000
Used BMW 3 Series"
1,697 Great Deals out of 39,942 listings starting at $888
Used Jeep Wrangler"
443 Great Deals out of 16,379 listings starting at $2,500
Used Honda Accord"
1,313 Great Deals out of 78,754 listings starting at $1,395
Used Honda Civic"
1,176 Great Deals out of 59,022 listings starting at $1,300

Used Cars For Sale

2017 Ford Mustang For Sale
12,159 listings starting at $21,495
2016 Ford Mustang For Sale
62 Great Deals out of 7,801 listings starting at $17,899
2015 Ford Mustang For Sale
179 Great Deals out of 4,230 listings starting at $16,195
2014 Ford Mustang For Sale
113 Great Deals out of 2,921 listings starting at $11,950
2013 Ford Mustang For Sale
44 Great Deals out of 1,442 listings starting at $9,999