No start again after changing CKP sensor
#21
01-21-2019, 09:13 PM
Recovery Vehicle
OK, let's say that you have both fuel and spark power. 135 compression is fine, too. Make darn sure that you are correct on these 3 things.
If correct...
Gaps that are too large on your plugs means that your plugs won't fire even with power reaching them.
Water, coolant, or oil/debris on your spark plug gaps also mean that they won't fire.
Keep in mind that water on your spark plugs can come from filling a gas tank with water inste4ad of gasoline.
Also, check your air filter to throttle body for no obstructions. Even with spark, fuel, and compression, no air reaching your cylinders means no fire.
Same goes for clogged exhaust (banana in your tail pipe).
If correct...
Gaps that are too large on your plugs means that your plugs won't fire even with power reaching them.
Water, coolant, or oil/debris on your spark plug gaps also mean that they won't fire.
Keep in mind that water on your spark plugs can come from filling a gas tank with water inste4ad of gasoline.
Also, check your air filter to throttle body for no obstructions. Even with spark, fuel, and compression, no air reaching your cylinders means no fire.
Same goes for clogged exhaust (banana in your tail pipe).
Last edited by No Doubt; 01-21-2019 at 09:20 PM.
#22
01-26-2019, 05:41 PM
Ok I played around again today trying to get it to just hit once. I took out all the spark plugs and made sure there was no water or some contamination. Sprayed some starter fluid on each and reinstalled. Turned over, no hit. I sprayed some starter fluid into the intake and it ignited back toward me while my wife was trying to turn it over. Although I'm getting spark, it seems faint to me. Question is, could the spark be so weak it won't even hit? I pulled a plug again and it is getting fuel, although I have not checked my pressure yet. Any ideas? Any way to check a "weak" spark? I checked gap too and they are at .040, so nothing has changed since I changed them a year ago.
#25
01-28-2019, 03:28 PM
Hey, there’s no dumb questions as far as I’m concerned, I’ll take any help I can get. I’m pretty sure that I installed it correctly, as this is the second one I have put on, Just to make sure the first one wasn’t a g just to make sure the first one wasn’t a dud. I am also getting a signal, via rpm reading, when I hook up my scanner so I’m pretty sure it’s not the sensor.
#27
01-29-2019, 10:54 AM
Thanks No Doubt, I’m obviously not a rover mechanic but my experience with stuck valves should show up when checking compression, correct? I have been searching but really can’t find an answer to my last question if coils can fail suddenly causing a no start but still throwing a weak spark? I guess strong enough to ignite starter fluid but not enough for (excess) fuel.