Refresh on 4.6 stroker

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blu3fan
I made it to triple digits!
I made it to triple digits!
Posts: 178
Joined: June 23rd, 2010, 11:05 am
Stroker Displacement: 4.6
Vehicle Year: 1992
Vehicle Make: cherokee
Vehicle Model: jeep

Re: Refresh on 4.6 stroker

Post by blu3fan »

Shes all up and running.
After a little drive the lifter tick really quieted down to almost nothing. (im guessing the little tick now is the thin oil.... this break in oil from comp cams is like water thin) or maybe a bad lifter. (I reused the comp cams lifters from before. all in the same bore as before
oil pressure is great.
everything looks good so far.


weird thing happened. It got stuck in 2wd lo. had to drive in reverse like 1000ft to get it to say 2wd again.



Without this forum it would most likely still not be running.
Thank you so much jeep stroker forum.
and special thanks to russ and silver xj for your fast reply's throughout the entire build
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SilverXJ
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Joined: February 14th, 2008, 7:14 am
Stroker Displacement: 4.6L
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Vehicle Model: Cherokee
Location: Radford, Va

Re: Refresh on 4.6 stroker

Post by SilverXJ »

Did you reuse the old cam?
jeepxj3
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Re: Refresh on 4.6 stroker

Post by jeepxj3 »

So who left out that oil plug? your engine builder?
blu3fan
I made it to triple digits!
I made it to triple digits!
Posts: 178
Joined: June 23rd, 2010, 11:05 am
Stroker Displacement: 4.6
Vehicle Year: 1992
Vehicle Make: cherokee
Vehicle Model: jeep

Re: Refresh on 4.6 stroker

Post by blu3fan »

I did reuse the cam. New bearings though, it never ticked like this before though.
It's got a tick. It sort of sounds like a sewing machine, but way quieter.
I've never heard of air in a lifter ? Wouldn't it self cure?
Machinist took it out. I didn't install it. Not sure how I missed it
blu3fan
I made it to triple digits!
I made it to triple digits!
Posts: 178
Joined: June 23rd, 2010, 11:05 am
Stroker Displacement: 4.6
Vehicle Year: 1992
Vehicle Make: cherokee
Vehicle Model: jeep

Re: Refresh on 4.6 stroker

Post by blu3fan »

So shes up and running but I'm having a few problems
They may be related but I don't think they are.
ISSUE 1:
This issue began with the build. and appears still to be happening. (Didn't have this issue before I stroked her)
On startup. I have to hold the gas to make her idle.
Otherwise the rpms are too low and it stalls instantly.
After 2mins of keeping the revs at 1k I can release the gas and she idles *OKay**** Its still a really low idle. maybe 300-500rpm max.
At full temp she idles around 600. which I feel is really low.


ISSUE 2: (this issue was happening before the rebuild. just not as bad)
she is surging/hunting for idle
Up to 1k down to 500rpm
The surge almost goes away at normal operating temp. But can still be seen


ISSUE 3:
This does not happen every time. Its intermittent.
While driving. (Mind you I have yet to put my foot down and im babying the hell out of the engine)
Pulls off the line fine.
At about 3k rpms when it does shift.
It drops to 2400rpm Really sharply. then back into the gear it was in. (back to 3k now)
then it shifts.
So its like it goes into 2nd. then instantly back to 1st. then back to 2nd.
I checked transmission fluid levels. and they seem to be okay.


Any ideas ?

Ill get some videos up of the shifting thing. its just odd.

going to do a bunch of research tonight and see if I can find some things to try. Ill get back with what I find but any tips or ideas would be greatly appreciated

thinking About checking for any vacuum lines that may be loose or moved on the transmission ? or maybe sensors ?


One thing I wanna add.
When installing the engine. I may or may not have tapped that sensor in the top of the bellhousing ( I believe its the crank position sensor)
I know its 1year old with lifetime warranty. (I replaced it a while back trying to solve the issue where it needs gas to start it)
I did pull it off. No damage. Looks perfect. Not really sure if the engine tapped it. but I couldn't say for certain because I pushed from the back of the transmission. and it was right up on it when I got out from underneath to look.
I wanted to note that because some sensors are super delicate and If it did tap could this explain my shifting issue ?

Other things to note.

The fuel pressure regulator I'm using is from a 97 cherokee.. I think. Cannot remember fully I got it from a junkyard.. And to my knowledge I asked on this forum about it.
(mind you. this was 7-8 years ago) Believe the answer was that it was okay. (This is getting replaced.)
Fuel pump is new
Fuel filter is new
I have not ran a test on fuel pressure. but planning on buying a schrader valve attachment and a jeggs gauge soon.
jsawduste
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Posts: 1032
Joined: February 28th, 2008, 3:13 am
Stroker Displacement: 4.9
Location: Michigan

Re: Refresh on 4.6 stroker

Post by jsawduste »

Any codes being stored in the ECM ?

Vacuum leak(s) could be a real possibility. As could a defective IAC.

Your using the stock cam so this may not apply, a small air bleed drilled in the throttle plate. Most often helps with a little more stick then your running. Say in the wire drill range of the 30's. You can also turn the set screw on the TB that acts as a stop for a little more plate angle. Careful though you don't want to get to far into the TPS range. Typical cams with duration 15/20 degrees more then your running seem to like a bleed around a #35 ish. YMMV

Get the loose ends fixed and establish a baseline before deviating to far from stock.
blu3fan
I made it to triple digits!
I made it to triple digits!
Posts: 178
Joined: June 23rd, 2010, 11:05 am
Stroker Displacement: 4.6
Vehicle Year: 1992
Vehicle Make: cherokee
Vehicle Model: jeep

Re: Refresh on 4.6 stroker

Post by blu3fan »

Not a single check engine code.
The only engine code i have seen in 8 years was one for o2 sensor.
i replaced the sensor. and it went away
checked all vacuum lines.(Every line is new) all are hooked up right correct. none appear to have leaks.
jsawduste
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Joined: February 28th, 2008, 3:13 am
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Location: Michigan

Re: Refresh on 4.6 stroker

Post by jsawduste »

You can take a business card and slide it into the TB wall and partially block off the port for idle. If it continues to run with no change then the engine is drawing air from someplace other then the TB.

If the engine dies with just a little covering of the port you may not be passing enough air and a bleed might help. Same thing, a card under the throttle stop to give the plate a little more angle.

It`s a judgment call and you need to get a feel for what the engine wants.
blu3fan
I made it to triple digits!
I made it to triple digits!
Posts: 178
Joined: June 23rd, 2010, 11:05 am
Stroker Displacement: 4.6
Vehicle Year: 1992
Vehicle Make: cherokee
Vehicle Model: jeep

Re: Refresh on 4.6 stroker

Post by blu3fan »

The ticking got way quieter. if there is air it might be getting out. Still babying it.
its like cylinder 4/5 lifter.


still having that mis-shifting issue though. I'm going to pull each wire off the transmission one by one and check the wires as well as connecters. maybe put some di-electric grease in all of them. and new plastic wrap. then reconnect. just to make sure one of them didn't get pinched for some reason.
I might replace that crank position sensor.
Its really random though. happens more if I give it more gas.
It shifts down into the next gear.
then instantly back up. for a second.
then back into the next gear and is fine.



So I have done a bunch of research. and here's my overall thought.

#1 thought.
So This engine ran perfect prior to me stroking it.
It knocked. was the only reason I rebuilt it years ago.

Everything was taken out and stored nicely, then re-assembled .
So. I would like to think this could even be timing related.
Because thats the only real change here.

The cam Im running is the comp cams 68-232-4
It has a +3 onto the timing.
I left the cam to crank timing mark at 0 just as if a stock gear was on there.

And the distributor is set at 5o clock from passenger side looking over to driver. almost perfect on 3cm offset from the wire on the distributor. (I think this was what I was referred to do before.)
(ears off distributor were removed)

Is the timing wrong ?
I mean it cant be far off if it is right ? because it drives great. smoothness wise. I'm not seeing signs of it running rich
no pings.

thats all my ideas for now.
If its a sensor. (I have replaced quite a few now)
It could be the tps. I have yet to replace that.
Last edited by blu3fan on February 4th, 2016, 9:02 pm, edited 1 time in total.
blu3fan
I made it to triple digits!
I made it to triple digits!
Posts: 178
Joined: June 23rd, 2010, 11:05 am
Stroker Displacement: 4.6
Vehicle Year: 1992
Vehicle Make: cherokee
Vehicle Model: jeep

Re: Refresh on 4.6 stroker

Post by blu3fan »

jsawduste wrote:You can take a business card and slide it into the TB wall and partially block off the port for idle. If it continues to run with no change then the engine is drawing air from someplace other then the TB.

If the engine dies with just a little covering of the port you may not be passing enough air and a bleed might help. Same thing, a card under the throttle stop to give the plate a little more angle.

It`s a judgment call and you need to get a feel for what the engine wants.
Ill try something along these lines and see what I can find. Thats a good idea.
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beater_renix
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Joined: February 24th, 2013, 6:57 pm
Stroker Displacement: 4.6
Vehicle Year: 1989
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Vehicle Model: Cherokee

Re: Refresh on 4.6 stroker

Post by beater_renix »

Blu3fan,

I'm running the same cam and i struggled a bit making sure my timing was on.

http://www.jeepstrokers.com/forum/viewt ... 1&start=15

Cant speak to the other issue, but hopefully this helps.
-Awesome Quote...

Beater_Renix
blu3fan
I made it to triple digits!
I made it to triple digits!
Posts: 178
Joined: June 23rd, 2010, 11:05 am
Stroker Displacement: 4.6
Vehicle Year: 1992
Vehicle Make: cherokee
Vehicle Model: jeep

Re: Refresh on 4.6 stroker

Post by blu3fan »

That distributor tip idea is great. to cut it.
I believe it is really close to where it needs to be but that would help me confirm.
blu3fan
I made it to triple digits!
I made it to triple digits!
Posts: 178
Joined: June 23rd, 2010, 11:05 am
Stroker Displacement: 4.6
Vehicle Year: 1992
Vehicle Make: cherokee
Vehicle Model: jeep

Re: Refresh on 4.6 stroker

Post by blu3fan »

Cut the distributor open.
Yep. distributor was off.
After a small correction. she runs amazing.
and wow. to think it was that simple.
Still having this shifting issue.
I really wonder what it is.
It only happens on upshift.
Up a gear.
Then almost instantly down a gear.
then back up right away.
blu3fan
I made it to triple digits!
I made it to triple digits!
Posts: 178
Joined: June 23rd, 2010, 11:05 am
Stroker Displacement: 4.6
Vehicle Year: 1992
Vehicle Make: cherokee
Vehicle Model: jeep

Re: Refresh on 4.6 stroker

Post by blu3fan »

I was wrong.
after messing with the distributor. It did start first time. and idled around 600.
Started her up today.
same issue.
Dies instantly unless I give her some gas.
after 2mins of gas she idles at 600~ wavering slightly maybe up to 750-800rpms at times.
Checked to make sure the distributor hadn't moved. it hasn't.
Weird that it started and ran the last time.
Since. I have poured a ton of fuel injector cleaner into the gas tank. along with fresh 91.


I feel like I could adjust the screw on the throttle body and raise the idle manually. but this isn't a fix. its a band-aid at best. I feel like I shouldn't have to do that.

Definitely running better... way smoother. since the distributor move. but still idling way low.
So.
what Sensors should I be looking at replacing.
Throttle position sensor. and what else ?
Rock auto has all the sensors for cheap.... wouldn't hurt to pull and replace every one..


I'm going to be a little overkill and put electrical tape over all the vacuum lines. all are new. but who knows. could be leaking air ?



Ticking is almost gone. but still like a little sewing machine. Definitely a lifter. But I'm gonna put some mystery oil in there and see what happens. Gonna change the oil at 200 and see what we got.
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beater_renix
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Joined: February 24th, 2013, 6:57 pm
Stroker Displacement: 4.6
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Vehicle Model: Cherokee

Re: Refresh on 4.6 stroker

Post by beater_renix »

There's a lot of info out there for Low Idle, particularly on Renix, but most of it will still apply.

Most people say not to adjust the screw on the throttle body, except as a last resort. Check to see if your CCV is plugged.
The CCV is a small orifice that regulates a constant vacuum leak to clear crank case gases. Often people drill the hole slightly larger than it comes to help with Blow by. This is essentially a vacuum leak, and a vacuum leak will cause the engine to idle higher. If yours is plugged it will have a low idle. I'd also check the IAC is working, and the passage is not full of carbon. Assuming timing and fuel are correct you are not getting enough air. If all that doesn't fix it, turn the screw on the bottom of the throttle body, just do it slowly. 1/8 turn at a time then test it.
-Awesome Quote...

Beater_Renix
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