1993 corvette high idle It kind of surges and goes back normal just sitting there with the brake on, in drive. The PCM will adjust the IAC position for the programmed idle speed (this may take a couple of minutes, the engine may idle low or high initially, and the engine may surge. have not tried to see if i have codes yet. I'm new to this forum, although I've checked out the posts now and then to trouble shoot my problem. It tried idling at under 500 and stalled. Apr 2, 2007 · I still need to change my fuel filter but the idle/stalling problem hasn't happend since changing the PCV valve last weekend. Start engine. No issues technically. 2 miles. Anyhow, I've read many different forums of what could cause a high idle, but let me explain my problem first (before I try anything else). around 1500 and after a minute or two it raises up to 1800. Somewhere around 25 to 55 counts for the IAC with the engine fully warmed & at idle is normal. Now you're idling at +1000 in neutral so it'll stay running in gear. Sep 9, 2018 · But to answer your question, run the engine until fully warmed up, the shut it off. engine still idles high and does not want to restart till i hold on the floor like a flooded engine. 6, 11:1, Ported Heads, T56, 3:23, Pro5. After sitting awhile at stop light it will drop slightly to about 900 RPM. I Thank you all for tuning in to another video!SIGN THE RPM ACT TO HELP SAVE OUR RACECARS!!-- https://www. Well after getting my transmission done, I drove her home and parked her. May 15, 2012 · C4 Tech/Performance - 93 LT1 High Idle - Have a persistant high idle issue on my 93 LT1 ZF6. 64V in datamaster. I am measuring 20-21inHg (on vac gauge) reading from the EGR vac port, My MAP reading corresponds to this in datamaster, my TPS shows 0% at ~. When it first cranking it ran smooth until it tried to settle down to an idle. Started off week with car running really bad. Dec 2, 2012 · C4 Tech/Performance - 1993 high idle - I just got done doing opti and waterpump after bleeding the cooling system I fired up the car. just over 2. Aug 7, 2021 · 1993 Corvette Recalls, Technical Service Bulletins, & Maintenance Schedule. Feb 11, 2011 · 1993 Corvette Coupe Black/Black, 6-speed (SOLD - October 2009 :hello:) If the DAG is missing it is an air leak and that's the reason for the high idle, it's just 1993 corvette LT1 42,000 miles rough idle Oct 23, 2022 · C4 Tech/Performance - 1993 Corvette stalling issue - update - Good afternoon everyone. Aug 2, 2011 · C4 Tech/Performance - Extremely high Idle RPM - A couple weeks ago I had trouble cranking my vette, 1990. Idle speed should be governed by the ECM at approximately 600-650 rpm in "DRIVE" (for unmodified cars). In this year 1993 every C4 Corvette came with over 2 miles of wire if you stretched it all out and connected it together. Keep pulling it and extending it , until you get the idle speed you want. Dec 30, 2023 · C4 General Discussion - C4 Idle High - 1990 C4 Corvette, Base Model All of a sudden, about three weeks ago, the following started: 1) I start the car, cold start, it idles normally 2) After a few minutes of first drive, the RPM increases to around 3,000 in drive, stopped at a traffic light 3) When I am finished, Apr 7, 2005 · Actually, the minimum air setting won't change the idle speed unless it is jacked up too high to allow the engine to idle as slow as the ECM is commanding. Since I've had it, the engine has bogged down a bit when first put into gear (somewhat intermittent, may be tied to engine temp). Nov 11, 2024 · Your injector pulse width seems awfully high for idle speed. This happens. Here's the problem. Gave a little throttle and it woul run smooth at a normal idle Apr 28, 2010 · C4 Tech/Performance - LT1 Idle is too high1993 - Hey Guys. Shortly after, I find my idle now is running about 1600-1700 RPM - for no May 1, 2019 · C4 Tech/Performance - LT1 Idle is too high1993 - Hey Guys. Mar 9, 2012 · With a scan tool hooked up & your Corvette running at idle, watch the IAC counts carefully on the data display. Feb 1, 2020 · C4 Tech/Performance - 1992 corvette high RPM at idle issue - HI everyone, i been having issues with high rpm at idle. Then restart. Nov 15, 2011 · Once the idle RPM is set, place the transmission in PARK and turn off the engine. As you state in your example, with a 550 minimum air, the curb idle of 600 wouldn't be any different with a 400 or 450 minimum air setting. Idle speed in NEUTRAL or PARK is less significant, and will be higher. I drop down to ~1000rpm after warm up. The idle speed of the car was always around 1000/1100 rpm, I thought the Idle Valve Control was malfunctioning, so I replaced it. Problem went away on its on - believe it was bad gas (probably water in fuel) that was resolved when new gas mixed in. org/epa-news --If you enjoyed be sure to leave a Jan 27, 2021 · I have a problem with my C4 (1991 convertible l98 manual). Any advice on getting it to Idle is to high on my 93 vette. Jan 10, 2012 · C4 Tech/Performance - At idle; Engine stumbles and surges after warmup! - Hey all. if i step on the gas it comes back to idle at almost 2000rpm. Reving the engine off idle gradual up to 2,000RPM's, if the IAC is working correct, IAC counts will increase higher numerical. I put new gaskets and a new TPS Nov 29, 2012 · C4 Tech/Performance - '95 LT1 Corvette - High Idle - Odd week with this car. May 1, 2013 · C4 Tech/Performance - 1994 LT1 Corvette With High Idle - Need additional Solutions, HELP!!!! - Hello everyone and thanks for taking the time to read my post :). I have an update on my 93 Corvette that stalls randomly and sometimes starts right away and sometimes it takes a few minutes to start. The time and mileage intervals for each of the maintenance items included on this page were established by General Motors with the introduction of the 1993 Chevy Corvette. 3 millisecond pulse width. When I take my foot off the accelerator the engine will drop to 1,000 RPM. 1993 was the worst year for Corvette for wire and this car is what inspired GM to create GMLAN and network ECU's together so as to save on wiring redundancies. Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Apr 16, 2003 · C4 Tech/Performance - Correct idle speed, LT1 - Can someone tell me what the correct idle speed is for an LT1? Mine is a 95 LT1, 6M. 0 Dec 11, 2015 · Hello, I just purchased a 1994 corvette with 69,000 miles on it. Exterior Color is Polo Green with Tan interior. With that much on-time with the injectors, I'd expect pig-rich fuel trims and O2 sensor readings, but curiously I'm not seeing that. no check engine light. 7 LT-1 V-8 with 4-speed automatic transmission. The 1992-1993 ECM uses the high resolution pulse in conjunction with the low resolution pulse to control fuel injection and ignition control. when Mar 25, 2005 · 4) Adjust the screw in the throttle body until the idle speed drops to ~500rpm 5) Turn off the engine 6) Reconnect the IAC harness 7) Restart the engine and let idle. Also, the idle speed adjustment screw seems to be frozen or maybe has lock-tite on it. For reference, my 383 idles around the same manifold pressure and am only getting about 2. I removed the throttle body and i cleaned it. One day I was Sep 15, 2013 · C4 Tech/Performance - Normal idle for a '93?? - Every since I've owned my '93 (about 7 years and 44K to now 93K miles), it has exhibited what I'd consider a high idle. The farther you extend the IAC pintle ,the less airflow you get, hence the lower the Idle speed. I have since replace the ICM, ignition coil, and fuel filter and the issue persists. The idle mix ends up so lean the only way to make the car idle is get it up off the idle circuit (using the speed screw) allowing the higher volume fuel delivery of the main jets. The speed is burned into the prom. The high resolution pulse is used to control the fuel injectors sequentially, which did not occur until 1994 on all GM LT engines. 2 things here. Pull the IAC and extend the pintle some, then reinstall. I found some Jun 28, 2012 · It doesn't matter where the idle screw is it will either idle way too high or will bog down and idle way too low but sometimes it will idle fine LT1, Hotcam, PRW 1. Jun 26, 2011 · Vacuum leaks cause high idle. Up over 8 milliseconds. One day I was C4 Tech/Performance - Help me with my LT1 high idle, out of ideas - Back story: I bought a 92 in July and have been slowly bringing it back to working order. I followed the procedure indicated by the official manual to reset correct idle speed (slightly push the throttle, turn on the engine, let it run for 5 seconds. Well I went to drive it today, and whether it is cold or hot the idle is between 1200-1300 rpms. Aug 14, 2011 · tried to get the computer to reset the idle but it did not change anything. Two days later I went to crank it and I noticed it was idling really high, around 4300 rpm!!!! I noticed the upper intake manifold gasket had folded. Jan 3, 2023 · Metal oxidizes. sema. When stopped at idle, my engine stumbles, misses and surges erradically from about 600 RPM to 1200 or so after I've Jun 4, 2016 · Tsmooth68 Former Member Send Private Message Vette(s): 1993 Chevrolet Corvette Base Edition. It runs great, but after it gets hot, or sits a little bit after running, the idle goes from normal to about 1500 RPM's and goes back to idle. engine did not idle up or down like the computer was trying to reset. someone borrowed my scanner. I replaced the fuel pressure regulator and it fired right up. The information contained on this page is for reference only. Re-connect the electrical connector onto the IAC. Right now it idles at about 900 RPM which seems a little high to me. 1990 Midnight Blue Pearl Corvette, Z-51, 6 Speed, Ansa Performance Mufflers, Walker rear Y, ZR-1 Wheels, K&N + open lid, chip, GS Flares. 5. rjwthl cmaod phu qrrfwj gemmwaab ccyit gxams zpsd xlldkv tqpjj