does this sound like a valve timing issue?

kunar · Nov 14, 2007

i've have been having problems for a while with my truck. it slowly (month or so) went from normal, to bad mpg/low power/fuel smell, to dead on the road, wont start. after doing a quick compression test i have about 30 psi on cyl #1 and less than that on cyl #3 and #4. i didnt check the other three yet and i wont unless i have to but my best guess is that my timing set has slipped or broken and caused this issue. i had to do a timing set about 6 months ago after the little tooth sheared off of the bottom gear leaving me with similar compression test results. sound like im on the right track?

kunar · Nov 14, 2007

pulled the timing cover, nothing looks out of place. i cranked the engine over and the timing marks line up, nothing has slipped or skipped. anybdoy have any ideas? broken cam shaft???

rickcdewitt · Nov 14, 2007

throw a little oil in and check to rule out the rings

kunar · Nov 14, 2007

rickcdewitt said:
throw a little oil in and check to rule out the rings

i thought that too since its been sitting but i should still have more than 30 psi even if it was bone dry, right?

IMenriched · Nov 15, 2007

kunar said:
i thought that too since its been sitting but i should still have more than 30 psi even if it was bone dry, right?

Are you trying to turn this over by hand to get this compression reading? or using the starter?

That would my thought as well "more than 30 psi"...should be some where around 100psi. very healthy is more than that.
so... it is either leaking past the rings, or valves, or out a crack in block or head or the head gasket. possiblity of broken valve springs, or bent valve rods too. you can see that the list gets large quick. concidering that the 2.9 heads are a problem area...well you get the picture.

I'm sure others here will be able to give more info as to how to ascertain where is it leaking/loosing compression with readings form a compression test.

putting a spoon full of oil in each cylinder prior to compression test couldn't hurt.

If your confident that valves ,head and pistion/rings are reasonably solid ...maybe you've lost the roll pin in the distributor gear.

hope that helps

rickcdewitt · Nov 15, 2007

kunar said:
i thought that too since its been sitting but i should still have more than 30 psi even if it was bone dry, right?

the point of using oil is to check it dry then with oil.if it improves you know that rings are at least PART of the problem.

does this sound like a valve timing issue?

kunar

Forum Staff Member

kunar

Forum Staff Member

rickcdewitt

15+ Year Member

kunar

Forum Staff Member

IMenriched

15+ Year Member

rickcdewitt

15+ Year Member

Sponsored Ad

TRS Events & Gatherings

Latest posts

Featured Rangers

TRS Latest Video

Official TRS Merchandise

Follow TRS On Instagram

Latest Album Photos

Product Suggestions