4th cylinder not firing
4th cylinder not firing
my 4th cylinder will not fire up. i figured i just needed spark plugs and while i was at it i bought a new wire set and a cap and rotor. I changed the plugs the cap and rotor and the 4th cylinder will still not fire up. Whats the problem here?
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driftiteasy0113
- Posts: 571
- Joined: Sat Feb 10, 2007 11:40 am
- Car: SR PIGNOOOZZZE
Re: 4th cylinder not firing (Uberck)
is your rotor bad??maybe its not making contact with #4? possibly your distributor is bad
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speed breeder
- Posts: 3
- Joined: Thu Jan 08, 2009 5:06 am
- Car: Nissan 200sx S13, Toyota Hilux 2001 2.7 D/C, VW Polo
Re: 4th cylinder not firing (94_240sx)
Not firing up because of spark or fuel?
Remove spark plug lead and hold it close to the head in a dark area, to see if there is a spark between the lead and the head. This will tell you if there is spark...
Determine this first...
If there is spark obviously it something else and could be a faulty injector.
I would say not fuel, but spark, need to check the rotor as mentioned previously.
What motor is this on? KA?
Offtopic, but how many coils does it have?
You said rotor so I am assuming one coil.
If there is spark - check fueling and also compression test
I would check fueling by removing the connectors to the other 3 injectors, and all the plug leads.
Determine if you can smell the fuel coming out the exaust when turning the engine (starting).
Modified by speed breeder at 3:54 AM 2/27/2009
Remove spark plug lead and hold it close to the head in a dark area, to see if there is a spark between the lead and the head. This will tell you if there is spark...
Determine this first...
If there is spark obviously it something else and could be a faulty injector.
I would say not fuel, but spark, need to check the rotor as mentioned previously.
What motor is this on? KA?
Offtopic, but how many coils does it have?
You said rotor so I am assuming one coil.
If there is spark - check fueling and also compression test
I would check fueling by removing the connectors to the other 3 injectors, and all the plug leads.
Determine if you can smell the fuel coming out the exaust when turning the engine (starting).
Modified by speed breeder at 3:54 AM 2/27/2009
Re: 4th cylinder not firing (speed breeder)
+1 to the spark tests mentioned above. Also, You can also switch the wires only to eliminate any wire problems....
Switch the injectors 4 and 3 and see if now 3 doesn't fire up. If so, then it's a bum injector.
How's you're compression?
Switch the injectors 4 and 3 and see if now 3 doesn't fire up. If so, then it's a bum injector.
How's you're compression?