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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / November 20071993 Mercury Grand Marquis 4.6L Check Engine
Vehicle generally runs fine normally, but when driving down the highway for 20 miles or more, upon slowing down on the off ramp vehicle surges slightly, and idle increases when stopped. The engine light will come on momentarily from time to time when this occurs but can get no trouble codes out of it. There is a recall on the cruise control but the cruise control is currently disconnected awaiting recall parts. If someone has experienced this or can help troubleshoot the vehicle I would appreciate any information that you can supply. Thank You, Don Smith sounds like throttle body is dirty and needs cleaning as well as mas air flow asensor > Vehicle generally runs fine normally, but when driving down the > highway for 20 miles or more, upon slowing down on the off ramp [quoted text clipped - 7 lines] > Thank You, > Don Smith Thanks, will check the mass air flow sensor, but the throttle body was very dirty about a month ago and was cleaned and fuel injector cleaner additive added to the gas tank. Before the cleaning was when it was first noticed, but has persisted since. Hopefully, the MAF Sensor is the culprit. Will report back after the holidays. I know on some vehicles some sensors can be temporarily unplugged to assist in diagnosis. Would this be one of those sensors? Thank you very much for the assistance. Happy Thanksgiving to all those who celebrate the holiday. Don > sounds like throttle body is dirty and needs cleaning as well as mas air > flow asensor [quoted text clipped - 10 lines] > > Thank You, > > Don Smith get a ford EEC-IV reader with an extension cable you can buy both for $54 at amazon.com http://tinyurl.com/2k3kxo and look for codes when driving the car. cleaning only throttle body doesnt do much, but maybe you meant also EGR channels what are under throttle body elbow, bad EGR flow can cause check engine to come on too. but its hard to diagnose which element needs to be replaced. I'm having this problem in my 93 Vic, i already ordered all EGR related parts and will be replacing everything. But if its a EGR code try to clean the EGR channels first, instruction is at lincolnsonline in tech section. But in your case i suspect faulty IAC. buy motorcraft because other brands might not meet the specification. its $62,99 at millennium ford parts. part no. CX1660 I was on a trip, when I came back, it was much worse, idling very fast all the time, and it surges very often. (When I slow down it feels like someone is hitting the brake and letting go every second or so). The check engine light is on most of the time now. Out of desperation I bought a MAF Sensor but there was no change. Any other solutions come to mind? Thanks for any assistance. Don > sounds like throttle body is dirty and needs cleaning as well as mas air > flow asensor [quoted text clipped - 10 lines] > > Thank You, > > Don Smith > I was on a trip, when I came back, it was much worse, idling very fast > all the time, and it surges very often. (When I slow down it feels [quoted text clipped - 19 lines] > > > Thank You, > > > Don Smith NOTE/- D.Smith is right ! Yet clean/ on bottom is a { two wired on Plastic } are 2 screws. Unfasten/ wash the loaded run off dirt out of the spring/ with WD-40 ( if not the whole cleaning will fail also check your (high idle sensor) after this stage, Bye for now good luck / gord_truck/ |
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