Sold the YJ, now I own a Renix.

[Cnickgo]

I forgot how much Renix confuses/annoys me.

I bought a 1988 Comanche. Long bed metric ton, 4.0L, Pukegoat trans, 231, d30/d44. Its SOA rear and Rough Country long arm front. Pictures will come later. There is a lot of little stuff to fix or make the way I want it, but the drivetrain seems solid and it rides great. Heck, its the first Jeep I have purchased that drove itself home! Pictures will come tomorrow, I didn't stop today to take any.

So I'm chasing a high idle. Yesterday when I drove home from Concord it was just a high idle. Today I lost power momentarily and backfired from the exhaust while decelerating in gear, "engine braking". I've looked over vacuum lines once, need to recheck everything. The grounds were a bit screwy, the dipstick grounds were routed to the valve cover, so I fixed that. The battery ground goes to the A/C delete bracket.

I tested my TPS. It comes out to almost 17%, within .03 volts when I first tested it. I don't seem to have good sensor ground though, I have 5 ohms at the TPS, and I get the same 5 ohms even in the C101 connector. Fumbled around a lot more with the wiring, cleaned the IAC but ended up destroying the O-ring in the process, that will be replaced tomorrow, threw it all back together and still had the same high idle when I ran up to the shop to do an alignment.

I've been doing a lot of reading and have a list of things to do including replacing stock crimps, braided ground, check intake manifold bolts, replace that IAC, maybe do a temporary ground splice on the TPS, anything else I can find written by cruiser in the first place. Welcome to owning a Renix?!?

 

[xjtrailrider]

EGR issue, it will cause a high idle and backfires/stumbles

 

[shortxjdoug]

You need to get with Nate...... His manche/now my manche runs impressively well. The c101 has been bypassed on it I think. I have the renix fuel injection manual stored away somewhere and he has copies as well.

There are days I hate renix.... But overall I'm happy I own at least one

I have one of each come to think of it

 

[UNCC_99XJ]

X2 on getting with Nate. He's helped me with Renix stuff in the past as well, as it's not my specialty.

Like I said last night, your truck is the only one i've come across yet where i'm glad the doors don't line up on it from being removed in the past. Makes playing go fish for the all important keys you locked in it that much easier. Knowing Concord police, i'm honestly surprised one of them didn't roll up and wonder what we were doing...

 

[Cnickgo]

EGR wasn't functioning in the first place, no transducer. I pull the pin out manually and the engine chokes out/stalls.

Tightened intake manifold bolts. Replaced IAC o-ring.

I made a temporary ground for the sensors. My TPS reference voltage is 4.85. The Output was .78v. That comes out to 16%. Adjust the TPS sensor to 17%, .81v. Idle goes up. High. How high IDK, no tach. I can get it down to almost normal using the last part of cruisers adjustment where you move the sensor clockwise, then back to the correct voltage. If I shut the engine off, when I crank it up again the idle shoots up very high. Bad TPS? This TPS is also for an automatic, do I need to be adjusting like an auto then?

 

[shortxjdoug]

Everything look good with the IAC and the MAP? Check the vac line headed to the map. It sounds like an IAC issue but I would need to lay hands on it to get a better idea of what's happening. Dont use the tps to set idle, set it where it needs to be per the fsm snd leave it. The waggy did the same thing and IIRC a new iac cleared it up. A bad tps really shows itself on acceleration, what will happen is you'll get a "gap" in the voltage where it hits a bad spot. No matter where it is it will default to the idle position if the voltage drops out....not a fun way to drive. you can check it by keeping the meter hooked up and opening the plate and check to see where and if the voltage drops. Kill all the stupid vacuum crap, use good plugs. It makes life so much better.

This may sound dumb, but check all the throttle linkages. Stuff can get caught and hang up that wonky renix up and down linkage. Might as well make sure the plate is closing all the way before you rip stuff apart.

They all do weird stuff.... Mine hunts up and down until it warms up, once it's warm it idles smooth like butter


Where's the pics?

 

[revmaynard]

This makes me regret buying a Renix considering I don't even have mine going yet.

 

[Cnickgo]

Routed new grounds the right way. Also had to replace my coolant bottle.

I've now got the ground wire going into the c101 connector down to 3ohms to the negative battery terminal. I still have the jumper for the TPS, IAC and IAT grounds going straight to the negative terminal. Not sure whats causing this resistance, it' somewhere after the c101 connector.

Put on a new TPS, did the same thing, idled up very high ~3000rpm, if I loosen the TPS and turn it clockwise while the engine is running, then set it to the 0.8v, it drops to maybe 1000-1300rpm or better. Shut the engine off and crank it back up, it goes to 3000rpm (approximation).

Not sure where to go from here. I hate throwing parts at it but I'm tempted to go for an IAC.

 

[Cnickgo]

There's one picture for now.

 

[Shorty]

welcome to the wonderful world of Renix!! Did you pull the throttle body and clean the IAC passages too? I've solved a bunch of headaches with a T.B. clean-up.

 

[Cnickgo]

welcome to the wonderful world of Renix!! Did you pull the throttle body and clean the IAC passages too? I've solved a bunch of headaches with a T.B. clean-up.

The whole TB is squeaky clean now. On the way to a distant parts house for the IAC. Trying not to get my hopes up.

 

[xjtrailrider]

I own 2 RENIX rigs and I never have an issue with them. Its easy to tell when things are going south then just get out the DVM and find/fix it!

I like that MJ, I have seen it somewhere before?

 

[87manche]

kill it with fire!

this is the holley IAC part #
http://www.holley.com/543-105.asp

you'll find it substantially cheaper than the oem part number.

From my fun times with high idle I will nearly guarantee that the IAC is hanging up and causing it.
it goes to full open at start, gets stuck and then it's a 3 grand idle.

After you start it, get out and whack the IAC. if it drops immediately, that IAC is hosed or there'a a ridge/crap in the bore.
I've never had C101 issues affect anything other than the power coming into the cab.
3 ohms is decent for circuit sensor resistance. It's not gonna get much better than that. Does it still have the ground strap connected to the back of the head? If not go get a 12" lawnmower battery cable at the parts store and put it there. That one will make a difference for your sensors.

 

[IllianaXJ]

I like the ZJ wheels

 

[shortxjdoug]

kill it with fire!

this is the holley IAC part #
http://www.holley.com/543-105.asp

you'll find it substantially cheaper than the oem part number.

From my fun times with high idle I will nearly guarantee that the IAC is hanging up and causing it.
it goes to full open at start, gets stuck and then it's a 3 grand idle.

After you start it, get out and whack the IAC. if it drops immediately, that IAC is hosed or there'a a ridge/crap in the bore.
I've never had C101 issues affect anything other than the power coming into the cab.
3 ohms is decent for circuit sensor resistance. It's not gonna get much better than that. Does it still have the ground strap connected to the back of the head? If not go get a 12" lawnmower battery cable at the parts store and put it there. That one will make a difference for your sensors.

see i told you....just call nate

 

[xjtrailrider]

The Holley IAC does not work well with the RENIX, I tried it. It will work with the HO TB.

 

[043500]

Carmine should post up soon too. he's our resident renix expert down here and has helped me with the 2 I've owned (my MJ is one) and has had several himself.

They do have their gremlins but overall I've loved them as much as any of my HO's (and I've had a LOT of HO's).

Sweet MJ though. Mine is an '87 metric ton 2WD...well it was when it was new anyway...you wouldn't know it now though.

 

[Ghost]

Need more pictures.

 

[Cnickgo]

TPS and IAC are new. Now it will start and run up to 3000+ rpm, then in about 30 seconds to idle down to a good idle below 1000.

I drove it less about 5 miles to pick up a paycheck and go to the bank, when I started up it would not come down from the 3000+. Came back home, yelled at it, walked inside for awhile, came back out and it starts high and comes down to normal. Then the starter takes a crap.

Go get a starter, put that in, now it just seems random when it wants to idle down. It will stay at a good idle as long as I don't shut it down.

 

[Ghost]

TPS and IAC are new. Now it will start and run up to 3000+ rpm, then in about 30 seconds to idle down to a good idle below 1000.

I drove it less about 5 miles to pick up a paycheck and go to the bank, when I started up it would not come down from the 3000+. Came back home, yelled at it, walked inside for awhile, came back out and it starts high and comes down to normal. Then the starter takes a crap.

Go get a starter, put that in, now it just seems random when it wants to idle down. It will stay at a good idle as long as I don't shut it down.

possessed?