Lugged engine, now running rough??
12-09-2017, 04:18 PM
#1
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Thread Starter
Lugged engine, now running rough??
as the title states, I lugged the engine (put in 2nd instead of 1st) and then tried to give it gas, now its running a little rough. can kind of hear it too a little. Thinking I popped a vac line??
Oh and the CEL came on
Oh and the CEL came on
Last edited by Not_Sure; 12-10-2017 at 07:46 PM.
12-10-2017, 01:13 PM
#5
Rennlist Member
I have seen similar situation where the knock sensors will retard/adjust the timing and the check engine light comes on. After about 15-30 miles/15-30 minutes of normal driving and no lugging/knocking the engine computer will turn the check engine light off and re-adjust the timing. Wish I knew the exact sequence to report like X amount of miles, or X amount of time but one or the other occurs and I bet you reset yours and get things back to normal. Check also that you have quality fuel in it.
12-10-2017, 06:09 PM
#6
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Thread Starter
Im wondering if it jumped timing (new belt)
fouled a plug, or something not so good.
what else could low rpm lugging cause such as creating a vac leak somehow
fouled a plug, or something not so good.
what else could low rpm lugging cause such as creating a vac leak somehow
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12-11-2017, 01:08 PM
#8
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Just for future testing, When doing cylinder spark "deactivation" I like to take a length of rubber hose (new gas line works best), you want the hose to fit snug over the plug and the plug boot. You can run the car with this tube in place (a good spark will jump the gap from the plug wire to the back of the plug). You then take a test light, ground it to the chassis (or directly to the battery negative terminal, even better), touch the test light to the tube and you will ground the spark through the hose. I don't recommend running the engine with more then two tubes in place at a time, and I like to stagger them via. the firing order when possible (i.e. cyl. 1 & 4, not 1 & 2)....1-3-4-2 firing order.
This method is great for 2 very important reasons.
1. It is safe, you (your body) are never the shortest path for "loose" spark to ground, 50k volts through your arm is bad!
2. The energy of the spark goes to ground. in some cases, pulling the plug boot leaves this energy with no place to go, it can build up in the ICM and cook critical components.....nothing worse then making more trouble upstream during the diagnostic process.
This method is great for 2 very important reasons.
1. It is safe, you (your body) are never the shortest path for "loose" spark to ground, 50k volts through your arm is bad!
2. The energy of the spark goes to ground. in some cases, pulling the plug boot leaves this energy with no place to go, it can build up in the ICM and cook critical components.....nothing worse then making more trouble upstream during the diagnostic process.