Ford - Mustang :: 1990 5.0 LX Stalling After Braking From Long Highway Driving


Jan 8, 2013

My 1990 mustang 5.0 LX has a very consistent stalling problem when travelling long distance on the highway at a good speed. After 2 hours of driving highway speeds and then pulling off the highway, the car stalls after I brake or stop at a light. I don't know why this seems braking related, but not sure. I then sit and crank the motor and it cranks for a bit and starts right up. I think it's fuel, but now sure yet.

Here's what I have done:1. Tune-up: plugs, wires, cap, rotor2. new fuel pressure regulator3. new fuel filter4. new fuel cap5. Checked for vacuum leaks (none found)

It seems to not happen when the gas tank is low, but I can't swear to it.

I'm going to run a fuel pressure gauge to the futhel rail and see if I can catch the drop off of fuel pressure when it occurs. Also, I noticed that the gas cap does not hiss when I unscrew it at any point in time.

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I have been having an on going issue with my 1990 Oldsmobile. It will randomly stall while I am driving. It has happened while driving at speeds ranging from 25 to 50 mph. It always happens while I am driving, not while I am stopped. First I will feel the engine buck, and then the check engine light comes on. After this, I have about 10 seconds until the car completely stalls out and I have to pull over and attempt to restart. Sometimes it will restart immediately, other times it takes a few minutes. Sometimes when it restarts, the engine will "roar" as if I were pushing the gas down while in park.

Sometimes when I get it to restart, I can continue driving and it will not happen again, but other times it will happen continuously. This has been going on for about 6 months. I have brought it to the shop several times. My mechanic had to drive it around for awhile before it would occur again and he could understand what was going on. I have had the thermostat, alternator, and throttle replaced. After getting all this work done, the problem did not occur for several months...until today.

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The motor seems to be fine and sounds good when running at proper temp. Recently, it will even die when the engine is all warmed up.Often when I get back in the car after driving it (while engine is still warm) I can turn it over almost instantaneously it doesn't necessarily sound good though. I noticed before all of this began that it would putter when going down a steep hill (or letting off of gas). Do I need to rebuild the carburetor ? Could it be as simple as a bad pcv valve? I have already put in 600+ into fixing this and no results. I am pretty convinced it some sort of fuel issue. I am also concerned the choke might be sticking and needs adjusting.

I brought it into the shop and they tightened the timing belt and secured some loose battery cables. They also said I needed to replace the battery which I then did. This did nothing to improve the how well my car ran. I brought it back and they replaced the distributor cap and adjusted the timing which apparently was way off. This did improve the performance of the vehicle but did not stop it from dying.

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My wife's 2005 Escape Hybrid has recently started acting up. After a bit of driving at semi-highway speeds (say 10 minutes), when you slow down to a stop- the car stalls out (or what feels like a stall to someone who drives a std transmission car). Sometimes, it comes back on when you turn off & on the car- sometimes it takes a minute of being off to turn back on. After a few cycles of this, the engine temperature warning goes off. After each stall, the car will be ok for a few minutes then stall again when slowing down (it seems to do it when you are under 20mph only- not that I am about to try to stall it at high-speeds). It has circa 70k miles on it, and is obviously in the shop- as it is unsafe to drive. It was a warm day when it first did it (say 80deg), and cooler (50) the next morning.

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I have a 2001 Ford Mustang, V6, 3.8 Liters, automatic transmission, 120,000 miles. Recently, my car has started to stall/misfire at when I come to a full stop at a red light. It feels like the car is going to shut down and like it has no power. I have to press the gas really hard to get it to pick up power and speed. It doesn't happen every time and I've noticed that it happens less early in the morning or at night, and it happens more often during the day when it is really hot (I live in Az and temperatures are currently in the 100sF).

The "service engine" light is not turning on. The battery was checked and it's fine (recently replaced in September 2011). The alternator was changed 1 month ago. The cooling fan was replaced 1 month ago. I took it the the Ford agency and no codes are turning up and they can't seem to duplicate the problem even though the ran the car for 15 miles. They checked coils, spark plugs, fuel injectors, fuel filter, gas pump pressure, and it all seems fine. They advised that I fill up my gas tank with Premium gas and add fuel injector cleaning fluid. I did and the problem is still there. They then advised to fill up gas tank again with Premium and add Techrnon additive. I did and the problem is still there.

I am scared that my car will stall and turn off while doing a left turn with oncoming traffic or in the freeway.

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Ford - Mustang :: Losing Power When Braking

Sometimes when I brake to come to a stop, my car loses power: the whole thing shudders, RPMs take a dive. It doesn't start immediately on braking. It starts when I am almost at a stop, but not at a full stop. If it's relevant, I generally brake quite gradually, starting several car lengths away. So there are several seconds between onset of braking and onset of power loss. It starts while the brake is depressed. It does not stop when I let up on the brake. It does stop when I depress the accelerator. If I am idling at a light, it might happen. If I am just going slow without braking, it doesn't happen. Braking is fine in all circumstances except coming to a full stop.

Details:'93 Mustang, 4-cyl, 2.3L, manual, fuel-injected

It's been doing this for years, actually, and yes, I've been just dealing with it instead of getting it checked out. Usually a little rev of the engine gets her through it. Last night, it actually stalled, several times in fact. It restarted, but it did take cranking it for a while for it to restart.

Now that I think about it, my battery might be up for replacement. It's probably around 7 years old, and the last 6 have been very light driving, maybe 3k per year. But like I said, this is an ongoing problem. What should I be thinking about besides the battery, and what is a mechanic likely to tell me?

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Replaced the fuel filter again. Still wouldn't run right.
Replaced the fuel pressure regulator. Same problem.
Replaced the throttle positioning switch. Same problem. Replaced the air control valve. same problem.

Found out that this car has an on board diagnostic doo hickey.
Found out how to check each sensor and component individually.

All sensors and components are working. Checked both fuel pumps and they are working. If I unplug the air flow sensor and the air control valve sensor, I can start the car using starter fluid and it will idle all day with out missing a lick.If I plug in either one of the sensors, it will kill it immediately.I don’t know what else to do to make this machine run.

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Still the same problem. after some troubleshooting i gave up and decided to take it to the stealer dealer. after a $130 diagnostic fee and a $300 repair fee they told me that they had fixed it by replacing a speed sensor in the transmission. the car was noticeably running better and did not stall during the short driving i did. I am a student so not much driving was done initially. A couple of months later i took a ~150 mile trip and upon stopping at a red light and trying to go once the light turned green the car stalled.

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I met a guy that worked for the dealer and had the same tech as the dealers so i took the car to him. he had it for 2 days and drove it for over 80 miles to test run it. he could no replicate the problem and just charged me 80 dollars just for his time.

I decided to take matters into my own hands and I read on these forums a couple of common solutions to the problem such as changing cam,crank,speed sensors etc etc and i started out with the crank..then speed...etc etc.

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