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Old 08-22-2017, 02:24 AM   #1
Deerhurst
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Default Its not lookin good Jim, shes making noises

Hey guys. I officially have my third ever issue that I havnt caused with my truck and it aint sounding good.

My previous actual issues were a bad oil pressure sender and a bad starter. Not a huge deal.

So, drove to work, about 15 miles, and all was good, quiet and smooth. Parked and spent my 9 hours there. Got off work, started the truck and began pulling the sun visor off the windshield and felt a weird lopy idle. Idle was fluctuating quite a bit. Oil pressure on my Autometer gauge was 50PSI but it was also weirdly fluctuating about 5PSI from high 40s to low 50s. 50PSI cold is a little low for my truck. Its usually 55+PSI cold idle but it was soaking in 80+F weather all day. Noticed those so I killed it. Opened the hood and fired it back up. Its got a clatter. Cant tell, with the 10 or so seconds I let I let it run for, if its top or bottom end. Gonna tow it tomorrow after work.

The plan is to check the oil before I have to drive it on a trailer and see if I can tell if its low (highly doubt it burned that much oil in 6K miles without me noticing) or if it might have metal in it. Ill be checking timing over the next few days to see if it jumps some teeth and ate a valve.


Anything else you guys can think of checking before I have to rip into it?
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Old 08-22-2017, 02:37 AM   #2
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Pull your spark plugs one at a time and inspect them, if they're wet you know a cylinder isn't firing. A bent/burned valve won't necessarily create metal in the oil but you will have low oil and usually one wet plug.

Draining the oil is a good idea, I don't trust the dipstick to give a good reading of how much oil is in the pan.

How many miles do you have on her now? Maybe do a compression test
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Old 08-22-2017, 02:46 AM   #3
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Bad bottom end or oil pump should give me shavings in the oil. Hoping to rule out bad bottom end.

Ill pull plugs. I think all were firing but it was just rough with fluctuating RPM. Kinda felt like it was starving for fuel. But the clatter is 100% mechanical. Also not consistent. It would go away and come back then get horrible and then suddenly disappear.

Im not burning any oils as far as I can tell. Even when running like crap it never smelled any different, was still very quiet and generally smooth and never had any smoke out the tail pipe as long as Ive owned it.

Plan to change the oil for the hell of it but do a quick check before I have to drive it onto a trailer.

She has 174K miles. Mostly highway and mostly driven like an old lady. Did the timing belt about 5-6K miles ago.
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Old 08-22-2017, 03:08 AM   #4
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Check your vacuum with a gauge.
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Old 08-22-2017, 04:17 AM   #5
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Didn't think to look at my vac gauge. If I have to start it tomorrow I will but I think it was fine. Just crappy running and sounded like it was coming apart from the inside.

I'll check tomorrow.
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Old 08-22-2017, 04:18 AM   #6
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Maybe pull your valve covers and rotate the engine over by hand and see if any of the rocker arms have a lot of play relative to the others. It could mean a lifter is going bad.
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Old 08-22-2017, 05:22 AM   #7
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Sounds good. Gonna go non invasive first then tear into it. Won't get it home till tomorrow.
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Old 08-22-2017, 11:58 AM   #8
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Maybe the timing chain jumped? If the V6 has one (IDK).
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Old 08-22-2017, 01:08 PM   #9
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Quote:
Originally Posted by LugNut1990 View Post
Maybe the timing chain jumped? If the V6 has one (IDK).
I was going to suggest the same thing, but I noticed in your sig that you have a V6. No chain in there.
Before you do anything, I'd suggest checking the timing on the belt. It's rare that they skip but I'd do that first.
It's also not too difficult.
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Old 08-22-2017, 01:43 PM   #10
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It sounds like something simple. With these trucks, it could only be a wire that was loose finally came free.

Be sure to pull the codes before you crack the engine open. It could just be the ECU bitching because it isn't getting a signal from somewhere.
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