The last time I did a compression test was long before fuel injection so please tell me what ASD is? I know where the fuel replay located. My thinking was to do cold pressure check, the warm the engine up to normal temp and do another test. I may need to watch a couple of videos on this since it's been maybe 30+ years since I did one but I need to get an idea of what is going on? I do know that starting it today the sucking noise came back but then stopped and again. That makes me wonder if something may be affecting the other sensor or such? Like I said earlier 7, it's smoking on and off (light gray or close to that) its up and down. Motor running fine, all gauges look good. Drove it a few blocks and down the road and is acting ok, My thinking is the compression test should help. I'm sure it may be a little low with 160,000 miles on her.

 

ASD (Auto Shutdown) Relay is right close to the fuel pump relay in the PDC, (power distribution center) It provides power to the coil, and injectors. (probably some other stuff as well...) Pulling them both disables the injectors, and coil, so you don't get any really rude surprises while testing.

Just do the dry/wet test, hot or cold doesn't really matter, its the difference between dry and wet that will tell the tale. (and, the compression numbers themselves) Supposedly, anything over 100PSI is "acceptable" with no more than a 10% difference between the highest, and lowest.

 

Than you. I felt a idiot asking. Today has been nothing but rain so I wont be able to get you those numbers to next weekend. It hasn't been smoking to knowledge till this issues with the injectors happened. Crossing my fingers hoping it may be some residue gas somewhere still burning it's way out but smelling around the tail pipe ( not huffing it lol) it just seems to smell like oil more then gas but the color of it hasn't changed. Kind of like the smell when oil hits the manifold burnt smell. If the smoke was black, then it would be obvious. Once the compression check is done. That will determine if I may need to get a leak down tool and try to find the culprit. Thanks Hey

 

No such thing as a stupid question. Except the one you don't know the answer to, that you DON'T ask. This is what we are here for.

 

Do you still have catalytic convertors on it? If so, they are probably contaminated by excess fuel which may be why you're having such a hard time clearing them out.

I had a PCM failure hang an injector wide open at 70 mph and actually set the convertor on fire inside. Fortunately the heat caused the head gasket to fail and put out the fire with coolant. That is one smell I will never forget.

 

Yes, it has it but the smell is questionable so doing a compression test wont hurt and it can get a idea of what may be going on. Truck it self is running good and gauges are showing everything is normal. No water in oil but it did have some gas so it was changed today. Smoking issue isn't near as bad as it was but just off and on were its light then you will see it more for a few minutes then die down then again. It seems a light gray but as Hey called it was a excessive fuel issue where one or more of the new injectors was faulty. Replaced with original injector and it was a lot better. I don't know of anyway to clean the convertor other then burning it off over time I am guessing. I just don't want to damage the motor by running it till I know for sure what is going on. Thankful I have a back up truck to run during this time.

 

A little perspective on 'cat's, brought to you by 26 years of Dodge ownership by Stevie.
I gutted my cat many years ago, cause it broke apart n clogged the exhaust n couldn't afford another one. Down here in the DFW area, 'ol blue, my '96 Ram doesn't even get hooked up to the inspection station computer anymore, which is a good thing. I don't use her to drive any distance anymore, but she does get plenty'o short 'HAUL' trips. At around 250K miles, my short n long term fuel trims are still averaging around 1-3% either side of "0", AFTER the 'cat gut, no matter whether idling or driving. I never seemed to have such numbers materialize before the 'cat was gone. I was told by a trusted mechanic....'you'll regret it (gutting), because it'll mess up your fuel trims, not to mention, set off your money lite!' The inexorable march of time taught me that...neither came about. In fact, I think I musta gotten another 10-20 ponies outta my 5 2, that wasn't there before. Even before the cat broke up. So, if ya don't have the tailpipe sniffing inspectors in your region...

 

I agree - As long as there isn't a O2 sensor after the cat, the pcm will never know it's gone. My point was only that contamination on an old catalyst can seem to take forever to burn off. Dumping a bunch of excess fuel on a functional cat can result in an internal fire and a whole different set of problems.

 

I'm pretty sure there is a o2 behind the cat. I'm not sure how much fuel made it in there but the smoking at this point is pretty minimal where it's light on and off like during the winter months. If needed, I can look for a new one and have it installed. I also question if maybe it may have cause some problems with sensor(s)? It took maybe 15 minutes to make it back home so it wasn't very long running with the injector acting up.

 

Update: Started it today and let it run for about an hour and it didn't smoke but maybe few minutes very lightly then stopped and wasn't smoking so that makes me think it was some residue of what was maybe left in the convertor. Everything looks good so will be doing a good test run this weekend. I'm just glad everything is looking good so far.