4.6L (1996-2004 Modular) MustangTechnical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within. Sponsored by Cruizin Concepts
Welcome to Mustang Forums!
Welcome to Mustang Forums.
You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!
I have a 2002 GT(5 spd) and am having some idle issues with it. I had the clutch replaced late in the summer and the car has never been right since.
The car has a really rough idle when coming to a stop with the clutch pushed in or in neutral. The idle hangs around 1100 - 1200 until the car is completly stopped then drops to normal idle and is smooth(there may be a slight miss at idle but it's hard to tell). Tonight i stopped at the top of a steep hill, let the idle level out and then took my foot off the brake and rolled in neutral, the tach was climbing with speed. This baffles me, I didn't touch the gas and the rpm's were climbing as the speed increased. Also I have been noticing a real rich smell when i get on it hard, or possibly a bad cat smell. But there has never been a check engine light or any codes.
So far I have replaced IAC, changed fuel filter, plugs(used stock platinums), and changed PCV and hose. I have had the car at the dealer a few times, they did a power balance, injector flow test, and injector pulse or pressure(not sure about this one) and also a dynamic compression test and said all was fine.I have just been dealing with the problem, but i am also trying to sell the car and it's hard to sell something that runs like crap.
Could it be something to do with the speed sensor on the tranny, or a messed up throttle position sensor. I have read about a few other issues like this after the car has been tuned, but mine is stock except for a catback.
This ad is not displayed to registered or logged-in members. Register your free account today and become a member on Mustang Forums!
I asked about them at the dealer, and the mechanic said they wouldn't cause the problem i am having. So any other opinions if coils could be causing an issue like this. At first i thought it was plugs and coils as well, i changed the plugs but I don't see how coils could cause the engine to speed up while rolling in neutral.
I have checked for vacuum leaks, I might just pull off all the vacuum lines and replace them with new ones. Do they come as a kit or do I just buy the black rubber vacuum hose? How do I check the TPS, I know you have to check voltage but what wires do you check? And how would I check a cam position sensor and where is it?
This forum is owned and operated by Internet Brands, Inc., a Delaware
corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford
Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor