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98 Dodge 1500, 318 Problems


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  #1  
Old 05-22-2014, 10:27:45 PM
uglyblue66 uglyblue66 is offline
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Default 98 Dodge 1500, 318 Problems

Ok I am fishing for ideas here as my dads truck has a issue.I think serious.
It started skipping and I plugged the little scanner I have into it and it said random missfire, missfire on 3 and 7.
Well I changed those plugs and no change in running.
There is something rattleing in the y pipe.
It has hardly no power at all and moans very load from under the hood.
There is no engine rattle,only the rattling loose thing in the y pipe. The plugs looked fine.
I have not done anything else but will be working on it to see what is wrong.He needs to know if he needs to get another truck or if we can fix this 1.
I have questions but mostly need ideas as to what to check.
I am curious as the moaning would indicate compresion going into the air intake?
So a injector or intake valve could have broke or dropped?
It has a timeing chain I would think instead of a belt right?
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Old 05-22-2014, 10:34:47 PM
C-Wade7 C-Wade7 is online now
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Default Re: 98 dodge 1500,318 problems

Lack of power and rattle in exhaust makes me suspect cat converter came apart. Drop exhaust at manifold flanges by loosening bolts half way and letting it fall and see of it has power then.
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Old 05-22-2014, 10:36:32 PM
uglyblue66 uglyblue66 is offline
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Default Re: 98 dodge 1500,318 problems

Ok that is a cheap test to do for sure.And it is a high mileage truck.
He has been looking around for a newer 1 and was going to pass this 1 along to me at a later time.But it aint looking to good right now.
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Old 05-22-2014, 10:49:18 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: 98 dodge 1500,318 problems

You should be able to remove the upstream O2 sensors, this will give enough relief to test, an 18MM compression gauge hose will screw in if you want to check back pressure, under 2lb at 2000rpm.
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Old 05-22-2014, 11:03:45 PM
Thaumaturge Thaumaturge is offline
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Default Re: 98 dodge 1500,318 problems

From the symptoms you've given I'd check your plug WIRES, and maybe add a can of injector cleaner to tank. Beyond that I'd maybe do a compression test. Don't know about your rattle. But it might be unrelated to misfires.
Doc
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Old 05-23-2014, 06:16:27 AM
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Default Re: 98 dodge 1500,318 problems

I'd go with the cat converter idea first. It's not unknown for them to plug-up.

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Old 05-23-2014, 06:49:54 AM
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Default Re: 98 dodge 1500,318 problems

I've seen Y pipes collapse internally where the two pipes come together causing a nasty restriction.

As posted, take the pipes off at the Y and have a look see and run it without the cat and the rest of the system.

As it's a 98, I'll assume it has fuel injection which will rule out the following. File this away in your brain should you work on older Dodges.

On carbed 318/360's there was a problem whereas the exhaust passage in the intake manifold between banks will clog with carbon. This inhibits the manifold from heating and actuating the automatic choke netting a choke that rarely opens. This over rich situation will fry a catalytic in short order.
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Old 05-23-2014, 07:39:46 AM
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Default Re: 98 dodge 1500,318 problems

Thanks, naturaly when the truck messed up he and I both assumed the worst.
So I will take these ideas and after I get back from a funeral today I will get started checking. It is fuel injected
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Old 05-23-2014, 10:36:27 AM
Doug Tallman Doug Tallman is offline
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Default Re: 98 dodge 1500,318 problems

That engine has a bolt on plate on the bottom of the intake that requires a gasket. They were known to blow out. Disconnect the PCV and block it and the vent hole. Put a vacuum guage on the dipstick tube. If it shows vacuum, the gasket is leaking.
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Old 05-23-2014, 09:37:06 PM
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Default Re: 98 dodge 1500,318 problems

Thanks for the advice. I didnt make it in the shop today. Funeral, cruise in this evening to go to. Since my recent episode I decided I better slow down when I dont feel well so I did.
I will get to this tommorow.
I am thinking the cat is a good place to start as I have delt with similar cases on other vehicals and this 1 is showing the same signs they did.
I hope it is that simple.WIth all the junk broke around here and the yard work that needs doing, I dont need another project!
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Old 06-25-2014, 11:22:32 AM
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Default Re: 98 dodge 1500,318 problems

Just thought I would follow up.

I took the old convertor to the scrap man.It had come apart inside as I could see when I cut the pipes off it.
It brought 35 bucks. The man did say had it not been burned out, he woulda gone 70.
But that is better than nothing.
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Old 12-30-2014, 11:14:43 PM
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Default Re: 98 dodge 1500,318 problems

About due for it's 3rd oil change since this work was done and it is going strong.Thanks again for the help
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Old 07-10-2016, 06:10:58 PM
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Default Re: 98 dodge 1500,318 problems

Well to quote the lawman on the Blues Brothers movie, "It's that Sh-t box Dodge again". In my shop.
I just would like some input.
Here is the low down. 318 engine,automatic transmission
Oil was synthetic in the truck first 100,000 miles. Dad bought it and went to Havoline 10-30. Oil has been changed every 3000 miles since my dad has owned it. Little cards in the glove box with dates and such.
Mileage is up now to about 280,000. Truck was running fine until a couple months ago.The transmission slipped and then something really jurked hard in the transmission and my dad was barely able to limp the truck home. Once this major jerk happened the check gauges light came on and the oil pressure dropped to 0. It was only a couple miles home but when he parked the valves were rattling a bit. A breif wait and restart,the pressure is normal.


We had the transmission fixed last month and figured the oil filter might be stopped up or something as it was a Fram. But changing the filter didn't help. There was a large shaft in the transmission had froze up in the bearings and there was all kinds of stuff bad in it.
What is happening now is the truck starts,runs fine for a while down the road, and if you make gentle turns and stops, no problems. But it seems if you make a hard turn or stop, the check gauges light comes on and pressure goes to 0. If you drive it any like this,valves will start to rattle. So of course I cut the engine off, wait a minute, crank back up and go.

If the pressure was going to 0 and no rattling, I would change the sensor. But the rattle gives me the impression there is less pressure than desired.
The truck in the shop now. I am looking to pull the oil pan and see if I can find a issue with clogged pickup screen or tube or something of that sort. Will probably put a new oil pump in just for good measure being it aint a cake walk to get to it.

Would it be possiable to get 1 of those cameras and shine it up in thru the oil drain hole and see if there is something obvious to save some work? I don't know how they work or how small the camera thing is. I think the hold is like 1/2 inch.

so there is the story, any ideas or hints?
I know, trade the pos, but try explaining that to a 82 year old man that loves his truck and does not like the high prices or taxes on a new 1.
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Old 07-10-2016, 08:50:29 PM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: 98 dodge 1500,318 problems

Pull the pan, probably has sludge in it plugging the pickup screen. Park it and it settles, drive it and it picks it up again. Best to replace the pickup screen, the mesh collapses against the housing leaving only a small area for the oil to get through, it will plug much quicker than a new one.
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Old 07-11-2016, 06:42:05 AM
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Default Re: 98 dodge 1500,318 problems

I have a friend who had a van with, I think, a 318 in it.

On a trip, the oil light came on and, foolishly, he drove it to the next town. THAT cost him a new engine!

As he described it, there is a plastic(?) piece on the oil pickup that broke, causing the pickup to fall off resulting in loss of oil pressure.

In your case, I don't think the pickup has fallen off because oil pressure returns. It may be an air leak or something that gets worse when the oil is hot and thin.
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