Question about 1999 Jeep Grand Cherokee

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Timing correct firing off

Complete engine rebuild timing is spot on, but wont start and ignition is off, I timed it correctly, not the problem, new crankshaft p/s still firing off cylinder.... computer problems maybe? flywhell can only bolt on one way so its not off there, camshaft p/s is timed 11 o`clock, and positioned correctly at tdc....... im baffeled....

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What engine Shawn. ? how can we guess that?
besides following the FSM steps, we could:
ive rebuilt many engines (done many from scratch) +machine work.

1: I check compression 1st. on all cylinders. (i put oil in the cyl, 1 teaspoon) (some pros run oil gallery primers pumps first in pro rebuild shops) i just crank the zero fuel engine until i see max oil pressure.)

oops. ? no oil pressure, oops, compression bad. on 1 jug.
(all that good, so)
2: i then crank it over , with no spark or fuel and check for top end oiling. Valve covers off. (so those V.C go on last)
ive watched many an noob burn up a new engine, not doing the steps in the rebuilders books. it only takes me 30min. to do this. why skip it.?

3: ok , I got top end oil, got 150psi on all jugs. (hard work pay back)

4: i check for spark all cyl. it's strong, & out comes the timing light.
oops, timing is off, or spark wires routed wrong, (dizzy engines)
i check all cylinders for hot spark and #1 timed right. and routed right.
the strobe light never ever lies to me....

5: wow ,car runs on test fuel (spray can, CRC engine start with top end lube feature) (fuel pump is shut off on purpose , in all steps to here)
i repeat this say 3 times, listening carefully for noises, that are not good. (why start the engine and watch it blow up. )
It is so good, to hear it run for 3 seconds,, wow.
im 100% sure you can get here..... if you do the steps.
Now comes, light the fires and kick the tires. not FIRST.

6: now comes fuel
how to get fueling to work.
that takes understanding the ASD and how to use a $1 NOID lamp.

I check injectors then add fuel pressure.
are the injectors firing?
injectors ,click cranking ?(stethoscope tool $5)
if not, use the NOID, is the PCM firing the NOID? y/n?

why do this , with pump dead.
Answer to not wreck your new rings, all washed free of all oil buy
injected, unburned raw fuel .. that is why.
i get all my injectors firing then , turn the fuel pump on.
its your hard labor, 50 hours? to build and engine?
wana waste all that? nah.
I last , plug my fuel pump back in,
does the PCM start enging for 2 seconds, and then cuts fuel?

ive never burned up a new engine, yet,
im not lucky, or smart, just had good teachers.

jeep ways!
I kill my pump by pulling the pump feed wire.
i do that because some newer jeeps , kill everything (ASD) including spark,
if you pull the fuel pump relay. (jeeps with new pump monitor features)
so i cut the feed AFT of the relay, on all cars. (conn. pulled)
the FSM shows this spot.

hope that helps.

Posted on Apr 01, 2014


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Posted on Jan 02, 2017

  • 523 Answers

SOURCE: my 2000 jeep had a blown engine, I rebuilt it

I've been in this situation, frustrating as it gets. You have all of the makings of a engine that should run, compression, spark and fuel. If compression is good that's a constant and you can rest that it is ok. You have good gas and spark with that is has to be within the timing of all. You mentioned being number one cylinder on TDC, it is possible to have this and be 180 deg. off (rather then the top of the compression stroke you may be at the top of exhaust stroke) I'd reinvestigate this be certain No. cylinder is on its compresson stroke. If need be remove the valve cover and look at the valves to be certain they are both closed with the piston fully up. I have not worked on this engine so I am uncertain of the lifter type manual or automatic, I raise this fact because I have worked on an engine where as the lifters did not fully fill with oil (had to maunally do this) because the lifters did not fully open the engine would hardly run if at all) something else to look at. Please let me know the results; again I have been in this situation and it seems she should fire right-up but instead your given grey hairs.
Best of luck,

Posted on Oct 04, 2009

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