Chad'sCheep

Sooo, 90 renix, 285k, dd.
Runs smooth but idles around 350rpm in park.
Randomly shoots up to 2,000-3,000 rpm on start up, have to shut down and restart and hope it goes back to normal. The most it's happened was 3 startups in a row.
There's a new and clean iac valve, new fancy intake gasket, new tb gasket, clean tb, iat/mat sensor is probably original but cleaned.
Map is newish, new o2, cts is probably original, tps I believe is original and was adjusted to no avail.
New and clean grounds...
Having troubles back probing some connectors with my hand me down dmm, I know, need to upgrade.
What have I missed? And when revved at idle it throttles down fine to a "normal" rpm, then drops to 350-400rpm.

cruiser54

Click on the link in my signature and do Tips 1,3,4, and 5.

Chad'sCheep

I've done all those, and upgraded the ground strap.
Besides the connector/receptacle cleaning, they have all looked good so far. Relay block could use some cleaning. But on the iat connector, one of the male pins is off center and kinda have to give them a wiggle to connect them.

Chad'sCheep

I get the idea of back probing, plugs like the cts are a pita to test. Sometimes the leads don't pick up a reading when I stab them in (nicely)

cruiser54

Stick a sewing needle into the wire and use the clip-on leads from the meter then.

Chad'sCheep

Through the sheath? Does it matter if its before or after the plug?
Or into the plug probe style?
My dmm only has probes, recommendation for a good inexpensive MM?
Research shows everyone says get analog

cruiser54

Digital is fine. I've never had to do the sewing needle trick. Harbor Freight for a $5 meter.

Chad'sCheep

OK, so digital is fine for checking tps sweep? Mine is an older equus model with probes only and the points aren't very streamlined

cruiser54

[QUOTE=Chad'sCheep;3189337]OK, so digital is fine for checking tps sweep? Mine is an older equus model with probes only and the points aren't very streamlined[/QU

Sweep won't be an issue. Digital is fine.

Got a grinding wheel?

Chad'sCheep

[QUOTE=cruiser54;3189417]Yah, 4inch, dremel, samdpaper. Won't hurt anything reshaping those tips?

cruiser54

[QUOTE=Chad'sCheep;3190290]Never found a REnix TPS bad by doing a sweep test. The test in my Tips will find out if it's bad.

Chad'sCheep

[QUOTE=cruiser54;3190420]Ok, I'll do it again. If I remember correctly, the reading fluctuated a digit or two after adjusting and rechecking the numbers. I'm somewhat inept with the dmm. What is the arrow in the low part of the ohm section?

cruiser54

[QUOTE=Chad'sCheep;3191567]Stay with the flat 3 wire connector.

Chad'sCheep

[QUOTE=cruiser54;3191644]I always refer to your write up when I do it to be sure.
What's the deal with the IAT sensor, only Crown sells them? For kicks I asked the O'Reilly guy, and he even pulled out the book, but closest one had a male plug
and mine is female

cruiser54

[QUOTE=Chad'sCheep;3191667]Remove it and clean the rip with a sofr toothbrush and carb cleaner. It CAN be tested, ya know.