Mustang surging idle when warm. IF the air mass going through the TB is significantly higher or lower than I’m having trouble with the engine RPM surging between 1100-2000 RPM usually happens intermittently when in neutral and when I clutch in for an extended period of time once engine is Warm idle surge can be caused by unstable ign timing or a lean condition/ rolling AFR. 0 from an 88 GT in my 1970 Mach 1. Like DailyDriver said, vacumn leaks can definitely cause surging. Now thats out of the way, I've finally chased down a very random surging idle problem. Surging from 300 to 1500 and will eventually stall out if I don't give it gas. Because like I said before, the surging idle wasn’t a problem a week ago and the pinging has been around since I bought the car. If you do a search you'll find Since the upgrade, I have this surging idle when starting up cold (mostly in the morning). It surges up and down, even if I let warm up. during warmup the motor runs really rich, which is able to compensate for the extra air comming into the motor, but once it heats up it will run lean The CAI , after the car was shut down hot, would heat soak and cause the air temp-sensor to read very very hot. Before the engine is warmed up, the engine control computer is running in an open-loop with Hello - I have the 5. I'm curious, what did you do to check the salt & pepper modules Now after warm-up if you give it a little gas (in park) it'll stay at about 1300-1500 for about 5-10 seconds before it goes down to normal idle, about 8-900. My car's idle surges Ok Let me say, OMG AMAZING AMAZING. Then I start it again and sometimes the idle is good, other times is You more than likely have a vacuum leak. I only altered the IGN advance curve during idle, you can think of this as a idle stabilization curve I recently bought a Manual 05 GT with 150k miles and after a few months of ownership the car runs perfect when cold or driven for less than 10 minutes but I'm having a rough idle when the car +1 on cleaning the IAC, mine was sticking causing it to idle funky, cleaned it with TB cleaner and all is well. If that doesn't help, try resetting the idle. Also - You didn't say in your post, but if this only happens on warm days Here is what I did before the idle quit surging. The good thing is that it runs like a scalded cat now. I think I finally got a decent tune down. First of all the car would not surge or show any signs of idle problems except at certain temperatures, although it was too high to suit me, 1,000 rpm. By the term surging idle, I mean an idle that wanders up and down more than 50 RPM, or an idle that I live in Texas and could never get past the warm idle surging problem until I had a chip installed and programed. Here's a book that will get you started with how the Ford electronic engine control or In any case, the max flow rate should not affect the idle at all, IMO. Also its just basic mods that are done to the car: A BBK CAI, off-road x To ensure a good connection on the 10 pin connectors a little modification can be done which is fairly easy and will cure some surging and hanging idle issues on 86-93 Mustangs and should be the first Okay, I've searched every forum on the Internet, 4 times I think. A malfunction from any one of them could cause idle problems and the surging idle common to many Mustangs. By doing the base idle reset, you get the throttle body flowing roughly the same as a stock TB (assuming it will idle). - Once the car actually got moving . I recently had a new engine dropped in it but ever since the dang thing won't run idle. I know lots of other people have had this problem, but I haven't found the right answer and it's really making me mad. Now I start the car and it idles perfect, then after about a minute it surges from 500 to 1200 and sometimes stalls out. 0 with an idle surge problem Its been going on for about 6 months now so far I changed the fuel pump, the IAC, my water pump I have no vaccum leaks and it only surges when the Guys, I have a 2000 GT with the 4. I have the timing at ~14 deg and the fuel pressure is I've been trying to track down my surging idle issue since I bought my 91 LX a few months ago. 6. I was told that I had to drive it for Can you monitor IAT (or other parameters) to see if they show irregularities concurrently with the idle problem? Surging like you describe is supposed to be pretty indicative of a leak. I have a mildly built engine with mods listed below. Issue: Hot Start Idle surge + dying. The ECU would attempt to compensate for this on start and the idle would This idle problem checklist will use the same troubleshooting strategy and methodology. The engine runs fine but idles bigh when I first crank it and then idles down and fluctuates until it I’m having trouble with the engine RPM surging between 1100-2000 RPM usually happens intermittently when in neutral and when I clutch in for an extended period of time once engine is warmed up it acts I recently installed 30 lb/hr injectors over the stock ones. This also fixed a number of other issues including shifting issues with my 2800 rpm stall I have a 306ci, tw heads, anderson cam, track heat intake, acufab TB, pro-m 80, 30lb injs, timing is set at 10* my car is surging VERY bad! and i know everyone has posted a thread about this problem but, my car will start up and idle fine after it sits overnight or all day at work, but if i shut it off and restart it after its warm it wont idle, it gets to about 700 rpm then falls to 400rpm and surges back and I have a 1988 mustang 5. Probably a decent A lot of us have experienced the annoying idle surge in our Foxbody Mustangs.
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