Yes Another renix low idle problem
Thread Starter
Member
Joined: Jun 2017
Posts: 159
Likes: 0
From: Yakima, WA Pacific Northwest
Year: 1990
Engine: 4.0 renix
The egr has been capped sense I got it but I am going to make me a little block off plate to completely rule it out. But I was looking at the vacuum diagram and the port that I left off yesterday runs to the air box on a stock setup. (Right under where the fuel pressure regulator line goes in the intake second one down). Why would the iac not adjust when that port is open?? But others it does??
I am really confused on why the iac reacts differently (or not at all) depending on where the air's entry point is on the intake
CF Veteran
Joined: Jun 2010
Posts: 1,220
Likes: 5
From: Arkansas
Year: 1987 & 1996
Model: Cherokee
Engine: 4.0
I would think it has to do with MAP signal, also remember vacuum is not constant, it surges with the opening and closing of the valves.
So that actually make since a small tiny map line would minimize that flux of the vacuum signal.
one last thing the IAC head can be twisted in and out to extend or retract it.
Actually pulled mine apart one time.
The RENIX Fuel injection manual says to when testing one make sure you don't overextend it, and should not move more than a 1/4".
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran
Joined: Jun 2010
Posts: 1,220
Likes: 5
From: Arkansas
Year: 1987 & 1996
Model: Cherokee
Engine: 4.0
Time move past there, no doubt he has and mentioned he cleaned all the grounds.
So unless he has a broke wire its not a ground issue.
So time to RTM....
BTW you have the Factory Renix manual on that site?
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Tip 5. What are the ohms values?
Thread Starter
Member
Joined: Jun 2017
Posts: 159
Likes: 0
From: Yakima, WA Pacific Northwest
Year: 1990
Engine: 4.0 renix
No, unfortunately I don't have a fsm yet. To this point I have got by with the internet.
i have thought about a ecu having bad readings from a voltage drop but haven't went down that avenue yet.
Sorry cruiser that air bleeder wasnt doin..idle was pretty rough and smelled rich. I went ahead and ran another vac line tapped in right behind the air filter. (1/4 brass barb) seems to be good to go..I have to put my dash back together so I can take it for a spin but so far so good
i have thought about a ecu having bad readings from a voltage drop but haven't went down that avenue yet.
Sorry cruiser that air bleeder wasnt doin..idle was pretty rough and smelled rich. I went ahead and ran another vac line tapped in right behind the air filter. (1/4 brass barb) seems to be good to go..I have to put my dash back together so I can take it for a spin but so far so good
Thread Starter
Member
Joined: Jun 2017
Posts: 159
Likes: 0
From: Yakima, WA Pacific Northwest
Year: 1990
Engine: 4.0 renix
No, unfortunately I don't have a fsm yet. To this point I have got by with the internet.
i have thought about a ecu having bad readings from a voltage drop but haven't went down that avenue yet.
Sorry cruiser that air bleeder wasnt doin..idle was pretty rough and smelled rich. I went ahead and ran another vac line tapped in right behind the air filter. (1/4 brass barb) seems to be good to go..I have to put my dash back together so I can take it for a spin but so far so good
i have thought about a ecu having bad readings from a voltage drop but haven't went down that avenue yet.
Sorry cruiser that air bleeder wasnt doin..idle was pretty rough and smelled rich. I went ahead and ran another vac line tapped in right behind the air filter. (1/4 brass barb) seems to be good to go..I have to put my dash back together so I can take it for a spin but so far so good
I'm not going to put the "fixed" tag on it just yet but I like the result so far.I also did some more research on that renix live scanner I mentioned, and it looks to be the ish. I give you LIVE reading from the ecu on sync, map pressure, iat, cts, O2, open closed loop, tps, and I'm sure I'm forgetting some but I am going to pick one up. The guy that make them claims it does everything those big scanners with the cartridges do. He has a couple YouTube videos one them. Just look up R.E.M. Scanner
Thread Starter
Member
Joined: Jun 2017
Posts: 159
Likes: 0
From: Yakima, WA Pacific Northwest
Year: 1990
Engine: 4.0 renix
And before I forget I just wanted to thank you guys for taking the time to help me out!! I have gained so much knowledge and experience working this problem out and I couldn't have done it without u guys. Like I said, I'm not going to put a bow on this quite yet but I am very optimistic.
Thread Starter
Member
Joined: Jun 2017
Posts: 159
Likes: 0
From: Yakima, WA Pacific Northwest
Year: 1990
Engine: 4.0 renix
To be honest I had added motivation of my wife not thinking I'd ever get it back on the road. It's taken me almost a year (bought it last February) but right now is the best by far, that it's ran. Now I can put my fender flares on and get me some mud flaps and be street legal. I'm stoked and I'm going to keep checking to do's off your list cruiser One more thanks!!
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
To be honest I had added motivation of my wife not thinking I'd ever get it back on the road. It's taken me almost a year (bought it last February) but right now is the best by far, that it's ran. Now I can put my fender flares on and get me some mud flaps and be street legal. I'm stoked and I'm going to keep checking to do's off your list cruiser One more thanks!!