Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Hi, I’m Cary and I’ll be helping you today.Please understand that I can't smell, hear, or touch the vehicle, so patience is appreciated. Before leaving the site make sure and leave me a rating. You can still reply to me as many times as needed, even after the rating..
Can you feel the engine misfiring.
If you can smell the cat conv I would assume the injector is firing, dumping fuel into the cyl and in the exhaust.
The sure way of course would be to check pulse.
The coil. You said it was firing. Did you remove the coil and leave it plugged in and check for spark that way?
What size engine?
A broken valve spring can cause a misfire and still have good compression spinning over at starter speed. I have seen this several times. I would remove the valve cover and inspect. It only pays 0.7 hours to R&R so it is not that hard. And the gasket is reusable.
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Yes it should. Just follow the coils of the spring from one end to the other. You may need a small mirror in some areas.
Just remember. There are 4 valves/springs per cyl. Look at all 4 on the cyl.
I will open this up to another expert to see if the can help. I have to go. Thank you.
Good evening and welcome to JustAnswer!!My name is ***** ***** I have worked for a Chrysler-Dodge-Jeep dealership for 19 years and I will do my best to help.
I will need for you to check the compression of cylinder #4 and tell me what you get..
If you are 100% sure that your loosing injector pulse for cylinder #4 then swap #4 with #3 injectors and then tell e if the misfire moves to #3 cylinder(P0303)
Since the misfire is staying on #4 it is time to check the compression..
If you got 180 in cylinder #4 then I would need for you to test the other 3 because 180 is on the high side and you may have a camshaft issue.. This world engine doesn't have rocker arms but rather buckets. The camshaft will push down on the bucket and the bucket is on top of the valves.. Spin the engine over with the valvecover off(Disable the ASD relay) and see if the camshaft is pushing down the bucket as the rest. Here is the valve lash:
Intake0.17 - 0.23 mm0.006 - 0.009 in.
Exhaust0.27 - 0.33 mm0.010 - 0.012 in.
Let me know your findings,
Yes you are correct the compression should be:
Compression Pressure1172 - 1551 kPa170 - 225 psi
The tapping your hearing is worrying me, can you tell if it's coming from in the head or outside the engine? If the PCM detects a misfire it will kill the injector to that cylinder...