Trying to track down an air conditioning problem. Seems like a vacuum leak somewhere is screwing with my AC and shutting it down upon giving it any throttle (hills etc). Where should I look first or is there a certain area that is prone to leaks?...truck is a stock 1993 F-350 460/auto.
View 1 RepliesJust acquired this car with 130k. The previous owner owned this car all throughout college and dumped an obscene amount of money into it for what it is. I have a stack of receipts and work orders several inches high that came with the car, with every single oil change nut and bolt this guy bought for it. It was sitting in his driveway for several months because couldn't get the thing running...it just stopped out of nowhere. He decided to part with it since he is working full time and has a wife and child to support.
The work that has been done from previous owner. All of this has been done in the past 2-4 years:
Fuel system: gas tank drained and cleaned out, fuel pump, fuel filter, fuel pressure regulator, new injectors.Ignition: distributor, distributor cap & rotor, spark plugs, spark plug wires. Coil is still original.Electrical: O2 sensor, ECM coolant temperature sensor, ECM (mom and pop shop replaced it with a junkyard unit from a different car, not 100% compatible with a 93 Excel).Engine: cylinder head rebuild, timing belt and components replaced.Misc: thermostat, coolant hoses, PCV valve, all vacuum hoses replaced, brand new exhaust from the converter back, converter has been hollowed out, new struts/shocks, tons of front end work, tires, MAF cleaned with appropriate cleaner, etc.
Here's what I have done:I replaced the throttle position sensor, replaced the air filter (it had a K&N that did not fit right), replaced the idle control servo, and also replaced the ECM with the correct one. Also replaced fuel filter, all fusible links, and the relay box for the fuel system. I've tested the TPS circuit extensively and it checks out both on the sensor side and ECM side. Also there is a TSB for a bad ground which would cause the TPS and motor position sensor circuits to mess up, but I have already checked them and they were fine.
Previous owner replaced a ton of parts, I can get the car to start and idle without much incident but as soon as you give it any throttle it gurgles pops and dies.
My 1999 F 250 5.4 liter. I know I have a vacuum leak because whenever I accelerate the air conditioning coming from the vents switches to the defroster. So my question is how do I go about finding the leak? My hubs in the front are manual so I know I don't have lines going up there. I do have some mechanical capabilities I've changed water pumps alternators brakes etc. But never anything with vacuum lines or a/c.
View 14 RepliesMy ford's 4x4 will work if I manually lock in the hubs. If i use the auto option it will not engage. I can feel the rear end diff lock when I put it in 4-low so I know the switch is working. I think it is a vacuum actuated system. How to find the leak or diagnose the problem?
View 7 RepliesI was using the method of spraying starter fluid around the intake and found a pretty significant vacuum leak around the throttle shaft on the drivers side. The carb is a 2 barrel holley. What are some different ways to seal a throttle shaft vacuum leak? Could I take it apart and seal it with a plastic O-ring for now?
View 2 RepliesI've read a vacuum leak will cause this problem and my wife heard a hissing noise when I applied the brakes on the way home for lunch. So I'm assuming a vacuum leak someplace in the brake system, but I've not found one yet using the carb cleaner approach. The brakes worked on the way home but on the way back to work they hardly work at all - very stiff. Could the vacuum booster be the problem?
View 5 RepliesWhen I put my 06 f350 in 4x4 my ac defaults to defrost. I assume this means a vacuum leak. My question is, is the white tube supposed to be open for air intake or plugged off with something?
View 5 RepliesSo I have an 05 f350 5.4 with the shift on the fly and the auto/manual locking hubs.. I already know I have a leak with the vacuum and I just use the hubs manually, then shift on the fly to activate the transfer case.
I went to use the 4wd the other night in a snow storm and I have no 4wd, light on the dash comes on and i can hear the transfer case clicking in when i hit the switch between 2wd and 4wd.
So I got under the truck while it was on the ground and manually locked the passenger side, Then tried spinning the axle and it wont spin freely, so obviously its locked.
Tried the same thing on the driver side and the axle spins freely while the hub is locked, So obviously the locking part of the hub is no good... So i guess my question is, even with just 1 wheel locking in the front, shouldn't I pretty much get 3wd? or am i missing something...will it not engage at all because both sides arent locked?
I have a 2007 Honda CRV. Last year the air conditioning stopped working and my local shop said the compressor went out and replaced it. It's been a very cold and wet spring so I haven't needed to use the air until the other day - and discovered it wasn't working again. Took it back and they said it was a leaky valve - replaced that and recharged it. When I drove it next, it was blowing cold air nicely, but I noticed when I stopped the car at a light, the car kinda shuddered like the engine was going to die. It didn't and I drove on, but the air conditioning stopped blowing cold air a little bit later. I turned it off, waited a minute and then when I turned it back on, the air was cold again. Every time I stopped the same thing would happen - engine acted like it was going to die and then air stopped working a little later.
View 4 RepliesLast year I literally replaced the entire A/C system in my 93 F150. (The compressor, the hoses and the evaporator were leaking and I toyed with converting it to 134A so I went ahead and replaced the condenser and all the rest of the parts. I ended up putting R12 back in it since I have a tank.)
I replaced everything, added oil, pulled a vacuum, leak tested it, and charged it back with 2.75 lbs of R12. The A/C worked then (and now) but it was not really cold. I got busy and did not have time to trouble shoot it until this weekend and the pressures and clutch cycle times were withing spec according to the repair manual - air was in the low 90's so the clutch was on constantly, low side pressure in the low 40s and high side in the 180s. The inside center vent air temperature never got below 60 after about a half hour of running on max. It eventually gets the inside temperature cool but not very quickly and certainly not enough to make me take it off high.
I thought maybe the blend door was not closing so I took the glove box apart and can hear the blend door slamming in both the full cold and full hot positions so unless the door has a hole in it or there is some other path around the heater core, I don't think this is the problem. I also double checked the orifice tube and I had used the blue one that again the repair manual calls for. What could be keeping the A/C from working???
I'm having problems starting my truck. The second it catches, it just dies right away. It doesn't stay running even if I keep giving it throttle. Although when I did try to start it 5-10 times the other day, one of those times, it started and stayed on for about 5 seconds then died again. What to check? I'm a complete newbie when it comes to this vehicle, but I would consider myself mechanically inclined since I've worked with newer cars and smaller engines before.
Also I don't know if this might be related, but I recently changed the oil & oil filter in the truck (after not having changed it for a long time).... and it was a castrol full synthetic high mileage oil. It ran and shifted a lot better for about a week before this starting problem happened. I checked the oil level and it's still perfect so I know it's not leaking oil or anything like that. Just wanted to throw this in there just in case.
I just bought an '08 r32 a few days ago. '08 with 17k on the odometer.
At low speeds (parking lot or stop and go traffic), giving it light throttle, the car lurches as if someone was giving it throttle and letting go.
Is this what is known as the hiccup problem (fuel tank vent) or the mechatronics problem?
Having issues with the vacuum falling off to the hubs when driving and light throttle. I know makes no sense,but kept fighting this thing making vary harsh rubbing sound since I bought it used and I know its the little collar on the back side of hub that engages to hub to make the 4x4 connection but it looses vacuum when driving and very light throttle/load.
I verified using a vacuum gauge ran inside vehicle when driving. Checked all lines and hubs,everything good. Solenoid has vacuum when running but seems to quit when light load or throttle and as soon as vacuum falls off then the collar starts to engage and rubs but doesn't fully engage. I don't get it. Unless there's something on the computer side of it shutting off the solenoid or something.
2005 F-350 diesel... When I first got it the radio was shutting off by its self, my 02 did the same thing so I wasn't to worried about it.
But things have advanced , radio shuts off , windows wont work? Goes on and off at will , does not seem to be road bump related as they go off and on when Im not moving.
Will stay off until I restart truck sometimes and other times it only stays off for a few minutes.
I just came across a deal on a 93 E350 motorhome for dirt cheap. It has a whine at 50 mph and believe its the rear end. The whine is under throttle not coast.
There is a tag on the axle housing that reads :
4:10 a diamond shape 2US AC
760553
Is this a Dana 60? Looks like a Dana.
I have a 93 F250 diesel 4X4 with the automatic, the transmission was rebuilt by a reputable shop les than 10000. miles ago, every few months it will act up, it will act like I put it in neutral then it slams back in gear, then it shifts very hard, sometimes it will not shift until i lift the throttle. Sometimes I can shut it off and when i start it again it will be back to normal, other times it will do this for a few days, then work fine for another month or two.
View 5 RepliesI have a 2002 F350 with the 7.3 diesel. I have had this truck since it had 30K miles on it and it now had 90K miles. It has been trouble free minus new pads and batteries. I recently changed the fuel filter and used a Donaldson filter. In the last week while driving the truck just mysteriously shuts off when I slow down for a stop sign. The only lights on the dash is the red battery light, and it fires right back up. I believe it has the original CPS in it as I have never changed it. Do you think this is the CPS going out or something else? I was wondering if the Donaldson fuel filter has anything to do with it?
View 5 RepliesI know all about vacuum leaks and such causing this problem, and I tend to think that is my problem. But isn't the temp change dial also vacuum controlled (in my case of an 06 f250 6.0) by that valve near the oil fill tube on the passenger side? I ask because, while I am stuck on defrost i can change the temp of the air that comes out still, telling me there is enough vacuum in the system to at least control that.
I also know everyone talks about checking the ESOF system for cracked lines/leaks, but this shouldn't come in to play unless I have 4WD selected or if the EFOF solenoid is bad, right? I just got done tearing the top end of this engine apart, twice, for oil temp problems and am about done working on this POS!!!
I have a 2005 Ford focus. I haven't even had it 8,000 miles. THREE times it has overheated, and I've had to replace over a gallon of coolant. The first two times, the cause was a leaky 'vacuum' cap. The third time it was a different cap that was leaking. This radiator has two (that I know of) unused ports on it. A 3/8" one on the top left, and a 5/8" one on the bottom left. They are capped off with little rubber vacuum caps, which are quite simple to replace. But, these things don't last long before they start to weather and crack and leak. I just replaced them after 2,000 miles (before they started to leak), and they're already cracked. But oddly, only on the OUTSIDE. Inside they're still smooth and unbroken.
I've asked for advice at auto parts stores, mechanics, and even at a radiator shop. They all say they've never heard anything like this before?! I just got some silicone vacuum caps which are specifically rated for high temps, but they're so thin I'm not sure I wanna install them.
Ok, I have capped off the vacuum lines to the front hubs and replaced the vacuum solenoid on the passenger inner fender. Still stuck on defrost. I know there are several options from this point what would be the next step after what I have just recently done. Going away on a ski trip and would like to have it working properly before I go.
View 14 RepliesSo I was was tired of trying to tune my Holley 650 and finally threw in the towel and got a 600 Edelbrock. When the holley was on there the engine had the slightest surge but I was never able to pin down a vacuum leak. The PCV valve made quite the racket while running.
Now the edelbrock is on there and no matter what I did I could not get the idle below 750 (4 speed truck). I checked the carb, manifold, hoses, and boosters and no vacuum leaks. I disconnected the PCV port at the carb and plugged it and it immediately stalled.
I went down to the local speed shop and got a new PCV grommet that has a small opening (restricting) and some foam filter material in it. Got home and popped it in and the idle dropped right down to a near stall. Adjusted the screw and she's running fine.
Now for the question. Did I fix the problem or just band aid it? Has anyone heard of having to restrict the PCV circuit?