30 Degree Startup
#16
Could be with thermal expansion/contraction there's a leak that flies under the radar except at extreme cold temperatures. FWIW though, mine does (did?) this too though, but not every time, and not quite as long as that..
#22
Noodle Jr.
Rennlist Member
Rennlist Member
Thread Starter
I might be crazy but it is kind of cool. The wifey was stink eyeing me as she came out of the garage and asked me when I was going to fix it......
#23
Seared
Rennlist Member
Rennlist Member
#24
It's not normal. My stock 95 (and in with vram) doesn't do this.
With the SC and ltw flywheel, it used to do this but I've since fixed it with finding and fixing vacuum leaks and adjusting the ISV.
With the SC and ltw flywheel, it used to do this but I've since fixed it with finding and fixing vacuum leaks and adjusting the ISV.
#25
Mine doesn't do this but I just went out and checked the ISV anyways. It was filthy and the valve could barely move. All cleaned up now and moving freely. Will see if it makes any difference next cold start.
#26
Rennlist Member
Unplug the O2 sensor, nothing changes.
MAF either works 100% or Zero, no in betweens, dirty or not
ISV should only be cleaned with WD40 or the likes. Cleaner and lube at the same time. Never brake cleaner, citrus cleaner etc. Make sure butterfly inside wiggles - rotates freely.
When there is humidity in the paper filter, the rpm's oscillate like this.
Cold start, where the whole car is in the cold.
After power washing engine
Long fast driving in heavy rain.
Regards
MAF either works 100% or Zero, no in betweens, dirty or not
ISV should only be cleaned with WD40 or the likes. Cleaner and lube at the same time. Never brake cleaner, citrus cleaner etc. Make sure butterfly inside wiggles - rotates freely.
When there is humidity in the paper filter, the rpm's oscillate like this.
Cold start, where the whole car is in the cold.
After power washing engine
Long fast driving in heavy rain.
Regards
#27
Rennlist Member
Is the clutch depressed or not? 95 should be OBD 1 - one o2 sensor, and if it's bad check engine light will illuminate. MAF is all or nothing. ISV or vacuum leak is my guess. My 95 doesn't do this, but I have a Steve W. chip.
#28
Burning Brakes
Mine does this as well only when it is very cold. In fact did it this morning when I started it up. I always thought it was normal? It finds the right RPM in about 20 secs.
#29
Technical Guru
Rennlist Member
Rennlist Member
On startup there is some extra fuel enrichment that is controlled by the CHT sensor which after ~20 seconds signals the DME to stop dumping extra fuel into the intake and to start paying attention to the O2 sensor. The hunting idle on startup is not unusual at all, its just more pronounced the colder the air temperature (you should only see this when the air temp is below freezing).