66 Chevelle LSA/4L90E Conversion
Teching In
Joined: Aug 2016
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From: Phoenix, AZ
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TECH Fanatic
Joined: Jul 2008
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Update......... After driving the car on many Road Tours and now having 34,000 miles on it....... I have to say adding the LSA to this car was the best thing that ever happened to the car........ I only had one minor glitch over the years and that was my fault...... The nut on the alternator Battery charging wire loosen up and I didn't catch it.......Took a real mechanic 2 minutes to find the issue..... LOL..... Averages 22.5 MPG on the highway with enough power to get the heartbeat going whenever your foot asks for it........ I don't think that for street driving any mod's are required to get the H.P. up as these engines have all the torque required for street driving.......
Ken
Ken
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Update....... Didn't drive the car much this year, been driving the Impala all over..... Took the Chevelle out last week for a local show..... the car ran perfect as usual... On the way home after getting off the highway I noticed the engine was running rough...... Humm!!!!..... I was 10 minutes from home so when I got the car in the garage (no check engine light) I plugged the scanner in and no codes....... Hummm!!!!!......Used the infared heat gun and shot all the Header pipes...... #3 cyl was showing no heat....... Humm !!!!....... Put a spare coil on and started it up .......Same thing......Pulled the spark plug and it looked O.K........ Checked for spark and everything good......Hummm!!!!!......Got Air....Got Spark..... Fuel????...put a Noid light on the plug on injector #3 and everything good....... Hummm !!!!...... The only thing that made any sense was that the injector went bad (36,000 miles)....... Ordered a new set and put them in and the car run's perfect again......... You never know...... LOL
The real question is why were you not getting a misfire code for that cylinder? That would have me concerned, I recently had a similar situation and after scanning I got a P0308 code telling me #8 cylinder was misfiring, I tried the easy stuff first as this motor has over 150k miles and I am the original owner and knew the plugs and wires had never been changed, I installed a new plug and spark plug wire and no change, swapped the coil with a known good one and that took care of the problem.
Thread Starter
TECH Fanatic
Joined: Jul 2008
Posts: 1,570
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The real question is why were you not getting a misfire code for that cylinder? That would have me concerned, I recently had a similar situation and after scanning I got a P0308 code telling me #8 cylinder was misfiring, I tried the easy stuff first as this motor has over 150k miles and I am the original owner and knew the plugs and wires had never been changed, I installed a new plug and spark plug wire and no change, swapped the coil with a known good one and that took care of the problem.
Don't know...... The cylinder was getting spark and as far as the computer knew the injector was firing also......There wasn't a dead miss in the engine, it just ran a little rough
TECH Senior Member
Joined: Jun 2016
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From: Central Cal.
I agree with this. As far as the ECM knew, all was functioning, except it wasn't. As long as everything is working electrically it sees nothing wrong. So no code(s).
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It can run rough and misfire and not kick a DTC for it. It has to exceed the misfire threshold before it will If the threshold is, it misses 1000 times in a certain time frame and it misses 999, You won't get a cylinder specific misfire but will probably get a P0300.
However you can watch real time misfires and see what cylinder(s)are misfiring.
Teching In
Joined: Oct 2013
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I have a build thread started. I was just trying to make conversations. Sorry to all. Not trying to intrude.
