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

[Sine Deviance]

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.

Ah, I thought we did have the MAF. No biggie.

[sharpxmen]

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.

think it's rather MAP, RPM and IAT (not TPS)

[JohnnyO]

I've used Auto-RX engine cleaner on several vehicles and swear by the stuff.  Running it in the Jeep right now.  It takes a few thousand miles for the whole procedure but the motor is smoother already.

www.auto-rx.com

[chrisfranklin]

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

Yeah, its great for uphill on-ramps when you're working on merging your 4Banger with traffic going by at 75mph        

[Sine Deviance]

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)

I checked NGK's parts lists and there is apparently only one series of plug they make that fit our 2.5L's; the FRx-1 V-Power series. From what I see here, the FR5-1 is the OEM equivalent, so I'm going to try some FR7-1's. Those would be two steps colder.

[sharpxmen]

I checked NGK's parts lists and there is apparently only one series of plug they make that fit our 2.5L's; the FRx-1 V-Power series. From what I see here, the FR5-1 is the OEM equivalent, so I'm going to try some FR7-1's. Those would be two steps colder.

that's what i was looking for too, but i could not find FR7 so i got a set of FR6
i also bought a set of BPR7ES but i did not test them yet so i can't speak of how they work (they're not the recommended ones). let me know if you find the 7s as i would like to buy a set as well.

[Sine Deviance]

let me know if you find the 7s as i would like to buy a set as well.

Will do!

[dwtaylorpdx]

Sea Foam is a great internal cleaner as well as combustion chamber.
For daily running I run quality synthetic and I use a bottle of Techron just before I'm ready for a oil change.

Everybody has their voodoo... :)


Dave

[Sine Deviance]

More info on spark plugs. Auto Zone doesn't carry any NGK plugs for our 2.5L's. They carry nothing in the FRx-1 series. They can order the FR5-1's from NGK but at $4 a plug and it'd take a few days for them to get here. They can't even order any of the colder plugs.


I'm gonna call NGK this week and see if I can order from them direct. I know they have an online distributor at ngk.com.

[sharpxmen]

More info on spark plugs. Auto Zone doesn't carry any NGK plugs for our 2.5L's. They carry nothing in the FRx-1 series. They can order the FR5-1's from NGK but at $4 a plug and it'd take a few days for them to get here. They can't even order any of the colder plugs.


I'm gonna call NGK this week and see if I can order from them direct. I know they have an online distributor at ngk.com.

check summitracing.com

[sharpxmen]

check summitracing.com

seems that ZFR7F is closer to the FR5-1 than the ones i got (BPR7ES) - it is v-power, 5/8'' wrench (as opposed to the BPR which is 13/16), same reach and as the FR it is extended projected tip (the BPR is listed only as projected tip).

i used the advanced tuner search on NGK website
http://www.ngk.com/search_char.asp?threadSize=14mm&hexSize=5%2F8%22+%2816mm%29&gap=&seatType=Gasket&terminalType=&heatRange=7&reach=19mm+%283%2F4%22%29&resistor=yes&action.x=61&action.y=11

[sharpxmen]

seems that ZFR7F is closer to the FR5-1 than the ones i got (BPR7ES) - it is v-power, 5/8'' wrench (as opposed to the BPR which is 13/16), same reach and as the FR it is extended projected tip (the BPR is listed only as projected tip).

i used the advanced tuner search on NGK website
http://www.ngk.com/search_char.asp?threadSize=14mm&hexSize=5%2F8%22+%2816mm%29&gap=&seatType=Gasket&terminalType=&heatRange=7&reach=19mm+%283%2F4%22%29&resistor=yes&action.x=61&action.y=11

i found this and might order 4 - at 1.99/plug it's ok even if they fail :)
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=380084512032

[GBJeep]

Sorry to drag this one up from the dead, but I am curious to know what you (Sine Deviance) ended up doing with this.

Thanks.

[smashcoast]

The best additive is a V8!

[Sine Deviance]

Sorry to drag this one up from the dead, but I am curious to know what you (Sine Deviance) ended up doing with this.

Thanks.

No problem. Believe it or not, the noise wasn't coming from the engine at all. It SOUNDED like pinging or valvetrain rattle, but it was actually the dust cover that bolts onto the bellhousing. I'll explain. Before I started having this problem I replaced my clutch. After driving it for a while the noise started. It had been at least a couple weeks since the clutch so I didn't think they were related.

After this thread, one day I started getting some very bad vibration when pulling out in first gear. I instantly thought "transmission is loose!" so I decided to crawl up under the Jeep and check the bellhousing bolts to make sure everything was still tight. They weren't. There were two or three bolts that had somehow managed to work their way loose, and a few of the bolts for the dust cover somehow got broken and fell out. The dust cover was only being held by one bolt and the transmission wasn't bolted up tight, so the dust cover was basically flapping in the wind at this point. That was where the sound was coming from.

I held up the dust cover and tightened all the bellhousing bolts. The sound went away and hasn't been seen since