Topic: What is a good top engine additive for our 2.5's?

[95yjman]

doesn't it make the thing smoke like crazy?

[Jeffy]

doesn't it make the thing smoke like crazy?

Only if you're adding it to the intake.

[Sine Deviance]

... Stuff about injectors ...

Ahh. Now I understand, thanks. I'll check the list. Are all of those a drop-in replacement for us, or would they need harness/intake mods?

probably pinging by the sounds of it, so scratch all i said about the lifters, you should def downshift when you hear that what rpm are we talking about?

All ranges. It could happen at 1500 RPM or 4000 RPM. It only happens when I put heavy load on the engine. For example, I can sit in my driveway in neutral and rev up to 4000 RPM and hold it, and I won't hear anything. But when I'm out driving and the engine actually has the weight of the Jeep on it, I can hear it easily anytime I give lots of throttle and it's in a higher gear (3rd gear and up usually.)

If I am getting pinging, is it because the mixture is too lean? I'm running a 4.0L TB and the intake in my sig. No other performance mods. She's definitely getting more air than stock. If I need to rich out the mixture a little how can I go about doing this easily? I know I could retard the timing a little but don't I have to reprogram the PCM to do that?

Thanks for any input you might have on this sharpxmen. I need to get this problem taken care of ASAP because my Jeep really needs to be reliable right now.

BTW: for a cleaner try Sea Foam.  You can use it for cleaning just about everything.

It's safe to pour some into the crankcase? And if so, how much should I use? Thanks Jeffy!

[sharpxmen]

Ahh. Now I understand, thanks. I'll check the list. Are all of those a drop-in replacement for us, or would they need harness/intake mods?

All ranges. It could happen at 1500 RPM or 4000 RPM. It only happens when I put heavy load on the engine. For example, I can sit in my driveway in neutral and rev up to 4000 RPM and hold it, and I won't hear anything. But when I'm out driving and the engine actually has the weight of the Jeep on it, I can hear it easily anytime I give lots of throttle and it's in a higher gear (3rd gear and up usually.)

If I am getting pinging, is it because the mixture is too lean? I'm running a 4.0L TB and the intake in my sig. No other performance mods. She's definitely getting more air than stock. If I need to rich out the mixture a little how can I go about doing this easily? I know I could retard the timing a little but don't I have to reprogram the PCM to do that?

Thanks for any input you might have on this sharpxmen. I need to get this problem taken care of ASAP because my Jeep really needs to be reliable right now.

It's safe to pour some into the crankcase? And if so, how much should I use? Thanks Jeffy!

there are a few things that can cause pinging - one is like you said the mixture too lean - but that is the cause of the cause - what it does it is actually increasing the temp in the chamber and causes the mixture to autoignite. the other reason is too high advance - now in this case it is not much you can do to retard the timing, you can change the position of the crank sensor but just a little bit as you don't have much room (so you need to move it the same direction as the engine rotates). there can be another reason that your igntion advance does not match the operating parameters of the engine and that is the IAT sensor - if that is faulty it can cause the PCM to think that the air is cooler than it actually is and therefore advance the spark more than needed to for a complete burn, and if it is hotter air than measured thru the IAT would cause pinging (hotter air would cause the mixture to burn faster). Another reason for detonation and pinging is heavy deposits in the chamber with 2 results: higher comp ratio and also deposits being hot and also not allow the chamber to be cooled fast enough would cause the mixture to autoignite

one thing i could suggest is to try a set of spark plugs 1 or even 2 numbers cooler than recommended - i can look it up tomorrow evening and see what i bought for my s/c setup (i got 2 numbers cooler) or you can do a search online (EDIT: the colder the plugs the faster they remove the heat from the chamber, the spark plugs actually help transferring out the heat after the ignition and detention process of the 4 stroke cycle - i think it's called detention but i am drawing a blank here so if i messed up i am talking about the expansion of the gases and the movement of the piston away from the cyl head)

can't speak for seafoam, never used it.

that list of injectors was not for Jeep, it's a list of P/Ns and flows, but if you find something that works you can def use it - keep in mind that you need high impedance and EV1 type connector (although if they are high imp you can still use them even with a different connector but you'll need pigtails). Don't go more than 10% more than stock on the resulting flow (for 39 psi fuel pressure).

[Sine Deviance]

there are a few things that can cause pinging - one is like you said the mixture too lean - but that is the cause of the cause - what it does it is actually increasing the temp in the chamber and causes the mixture to autoignite. the other reason is too high advance - now in this case it is not much you can do to retard the timing, you can change the position of the crank sensor but just a little bit as you don't have much room (so you need to move it the same direction as the engine rotates). there can be another reason that your igntion advance does not match the operating parameters of the engine and that is the IAT sensor - if that is faulty it can cause the PCM to think that the air is cooler than it actually is and therefore advance the spark more than needed to for a complete burn, and if it is hotter air than measured thru the IAT would cause pinging (hotter air would cause the mixture to burn faster). Another reason for detonation and pinging is heavy deposits in the chamber with 2 results: higher comp ratio and also deposits being hot and also not allow the chamber to be cooled fast enough would cause the mixture to autoignite

Okay... I'll check my O2 and IAT sensors. If this is a fuel delivery or cylinder temp problem, I'm thinking I'd rather just correct the problem instead of retarding the timing to offset it.

I noticed today that after driving for a while and letting the engine get completely up to temp the pinging seemed to have went away. It came back when the engine was cold again. But there's still a ticking noise when I give it heavy throttle even when the engine is warmed up.

one thing i could suggest is to try a set of spark plugs 1 or even 2 numbers cooler than recommended - i can look it up tomorrow evening and see what i bought for my s/c setup (i got 2 numbers cooler) or you can do a search online (EDIT: the colder the plugs the faster they remove the heat from the chamber, the spark plugs actually help transferring out the heat after the ignition and detention process of the 4 stroke cycle - i think it's called detention but i am drawing a blank here so if i messed up i am talking about the expansion of the gases and the movement of the piston away from the cyl head)

Yeah, if you can recommend me some colder plugs that'd be awesome! I'm willing to try anything. Thanks!

that list of injectors was not for Jeep, it's a list of P/Ns and flows, but if you find something that works you can def use it - keep in mind that you need high impedance and EV1 type connector (although if they are high imp you can still use them even with a different connector but you'll need pigtails). Don't go more than 10% more than stock on the resulting flow (for 39 psi fuel pressure).

Okay.

[sharpxmen]

Okay... I'll check my O2 and IAT sensors. If this is a fuel delivery or cylinder temp problem, I'm thinking I'd rather just correct the problem instead of retarding the timing to offset it.

I noticed today that after driving for a while and letting the engine get completely up to temp the pinging seemed to have went away. It came back when the engine was cold again. But there's still a ticking noise when I give it heavy throttle even when the engine is warmed up.

Yeah, if you can recommend me some colder plugs that'd be awesome! I'm willing to try anything. Thanks!

i agree - definitely try to fix the problem rather than messing with the crank sensor.
it's usually the other way around, should be pinging more when it gets hotter, so might still point towards the IAT and good call on the O2 as well.

just thinking here - it's a long shot though - but this can also happen if your PCM stays in closed loop (not going in open loop) which can be caused by erroneous readings off the TPS and/or MAP - just a thought in case you exhaust all the other avenues. i'll look for the NGK spark plugs p/n this evening when i get home.

[Jeffy]

It's safe to pour some into the crankcase? And if so, how much should I use? Thanks Jeffy!

Go find a can and read the instructions.  Most people use some in the intake, then pour some into their crank case then if there is some left over it goes into the tank.  You will want to follow the instructions.

[Sine Deviance]

i agree - definitely try to fix the problem rather than messing with the crank sensor.
it's usually the other way around, should be pinging more when it gets hotter, so might still point towards the IAT and good call on the O2 as well.

just thinking here - it's a long shot though - but this can also happen if your PCM stays in closed loop (not going in open loop) which can be caused by erroneous readings off the TPS and/or MAP - just a thought in case you exhaust all the other avenues. i'll look for the NGK spark plugs p/n this evening when i get home.

Well, I am running a brand-new PCM. I wonder if it needs to be flashed or something? I don't think that's the problem because my idle and such are spot-on, but who knows? I'll keep the TPS and MAP in mind as possibilities.

Go find a can and read the instructions.  Most people use some in the intake, then pour some into their crank case then if there is some left over it goes into the tank.  You will want to follow the instructions.

Ahh, so there are actually instructions on the can. Okay, thanks.

[bammerman]

Unfortunately, I don't know for certain if what I'm hearing is pinging or valvetrain rattle. I only hear it under heavy load, like WOT in 5th gear or driving up a hill.

I have that sound too and I thought it was my PVC going nuts due to my blow bye.  maybe I am hearing what you hear.

[neale_rs]

I think you should look into it.  Mine has valve train noise at idle but at WOT there is no way I could ever hear it with all the other noise (wind, exhaust, tire growl, etc).

[chrisfranklin]

Nitrous:  http://www.nitrousdirect.com/domesticnitrouskits.html.   

[Sine Deviance]

Nitrous:  http://www.nitrousdirect.com/domesticnitrouskits.html.   

Hahahahahaaaaa no.

[95yjman]

Hahahahahaaaaa no.

ah come on now....

[Sine Deviance]

I've been doing more research and a lot of what I'm seeing says to try cleaning the MAF first to get rid of the ticking under acceleration. What should I clean it with?

ah come on now....

Hey, since I'm currently worried about my engine exploding, nitrous would just be a great idea!

/sarcasm

[sharpxmen]

I've been doing more research and a lot of what I'm seeing says to try cleaning the MAF first to get rid of the ticking under acceleration. What should I clean it with?

Hey, since I'm currently worried about my engine exploding, nitrous would just be a great idea!

/sarcasm

there's no MAF on your Jeep (mass air flow - measures the air flow going into the engine). We have a MAP (manifold air pressure) and the system is called speed density (if i recall correctly) - uses the MAP, TPS and IAT to determine the amount of air going in.