I have a motocrap 2bbl on my 73 f-100 all stock 390 when I drop it into gear she wants to sputter and stall without warning at idle runs great but put a load on and forget it what is wrong with this thing?
View 4 RepliesI have an ambient temp switch connected to the vac port on my throttle emissions control solenoid for my 2150 carburetor. It's a 78 F-150 with a 5.0L 302, automatic 2WD. Would a bad ambient temp switch screw up my idle? I've disconnected the vac hose and it won't idle at all, and it does the same thing when I disconnect the two wires from the ambient temp switch. If I leave everything alone, I can get the idle down to around 1800rpm, but any lower than that and it stalls.
Is it possible to swap out this throttle emissions control solenoid with another type? I've looked everywhere and can't find an exact replacement, and I have no instructions on how to tune it.
I have a 73 f100, I want to paint it the color of a 2004-2015 the factory grey, this color or was there a darker grey
View 2 RepliesI am a newbie as far as fuel injection. The original issue the truck had was no fuel. I tracked down the issues to a blown fuel pump relay and a melted inertia switch. I jumped the inertia wires with a new fuel pump relay installed and the truck ran at an idle and up to 3500 RPM when stationary. If the truck is going up a grade or needs more throttle it will start to lose fuel pressure and end up stalling. I had the fuel pressure gauge connected to the schrader valve on the fuel rail and had 30-35 PSI when idling. It runs good under light load on the throttle.
Under heavy load it starts to drop quickly and if you back off the throttle it will stay running some times. I changed the fuel filter and also replaced the high pressure pump on the main frame and it still has the same problems.The original pump was pumping about 13 ounces of fuel in the 20 second test that the repair manual suggested. I have even placed a jumper wire direct to the new fuel pump to bypass original wiring and possible problems. When it stalls under load (No Fuel pressure) at the schrader valve you can hear the fuel pump running but there is no fuel pressure.
If I turn off the ignition for a few minutes and then turn the key back to the on position it will start to pressurize and then start and run at an idle. I even replace the ignition switch as it was a little temperamental. I have not changed or checked the fuel pressure regulator as it is a pain to get to at the back of the engine. I do not want to spend a fortune tracking down this problem since the truck may not even pass its smog inspection and may be a parts truck only.
67 F-250 4x4
73 Crew 4x2 (4x4 Soon)
89 F-250 Super Cab 4x4
i have a 78' F-250 4x4 4 speed with a straight 6. it has headers and an eldebrock 600 on an offenhouser dual plane intake. The carb just randomly started acting up the other day and what to try now. it will sputter and just about die when i first let off the clutch then it will suddenly start racin. its really annoying and hard to drive. i checked the inline fuel filter and it should be getting plenty of gas. didn't find any vacuum leaks.
View 14 RepliesMy 302, only mod is a 4160 600cfm and i love it. But when I kinda baby the throttle and the secondaries flop down to let fuel it... There is a massive lag time. Sometime it will even backfire! fronts have 59's (could be slightly richer) and the back has a 134-39 metering plate and a black spring. it seems that it needs another shot from an accelerator pump to keep going. I raised the float with the same result, how to cure that lag time without mashing the throttle.
View 14 RepliesIts a 2003 f-350 6.0 started out just stalling out throw it in N it would fire right back up then started to sputter now I have a no start doesn't even try to start no smoke on crank. all of this between -3 and 5 degrees outside. According to my scan gauge ipr is 14.8, have ficm sync, ficm main is between 47 and 48 cranking, builds 0 icp irp duty cycle doesn't go up either. Pretty sure my icp is bad leaks oil though the sensor and pig tail is covered in oil. Truck has 197000 miles hpop, injectors, and ficm changed around 165000 oil cooler and blue spring at 1800000...
View 13 RepliesI have a 2002 4.6L FX4. When I run the A/C for an extended period (say 15-20+ minutes), it will start to cough and sputter and eventually just die. It will restart but run rough and cough, sputter, die.
If I turn off A/C and let it set a while, it runs fine. No check engine light. Possible EGR problem????
I have a 77 ford f100 I am restoring. I have two factory am/fm radios. I bench test both with antenna male plug all the way in, and the fm works fine on both radios. The only way to get am to work, is to slide the male antenna plug all the way out till it is just touching, then if I jiggle it, the radio plays.
View 1 RepliesI have a 73 commando and if it sits for a couple of days the glass fuel filter goes dry and I have to pump and pump the accelerator to get it to start. I guess the fuel is draining back down into the gas tank. Had a carb kit put in. Go to a electric pump?
View 2 RepliesThis car started to stall sputter. I replaced the ignition module and it worked for while then nothing at all but still cranks. I checked all of the fuses and every thing was working. What I have found and i think this was the whole problem. The wiring harness that goes from the ignition module to the crank sensor, the wires were twisted and frayed and most likely grounding out on the frame and making the computer to shut down. So far after replacing the wires it started right up. Have not had a chance to take it for a test run to re learn the computer because my brake line busted.
View 1 RepliesI just picked up this 2005 Elantra last month. She runs GREAT - except after filling. Then she will occasionally sputter or sometimes stall during idle. Otherwise, if tank is below 3/4 (approximately), she runs fine.
View 7 Replieswhen the temperature is above roughly 60 degrees, I can drive the car for a short while, even a few miles, and it will start to sputter and eventually stall. At that point the car won't start, it turns over fine, but sounds like it's not getting any gas. If I wait 15-20 minutes it starts fine and will repeat the same process. Is there some temperature sensor or something that prevents the engine from starting after it gets hot, or is it something else. The temperature gauge doesn't indicate the engine is hotter than normal. I've taken it to my car shop twice and they haven't found anything. 1991 mercedes e300...
View 3 RepliesAs listed above I own a 98 Volkswagen Passat. It seems to run just fine for the most part, but if I push on the gas and let off I notice a slight sputter. The RPM's will drop to about 800RPM up to 1000RPM and back down again and it will eventually stabilize and idle fine. My only guess that I have so far that I read on a post somewhere is that the EGR Valve tends to get gunked up and stick. I will try to clean that off.
View 12 RepliesOutside of lawnmowers, this is my first carbureted engine. I have always fixed stuff that broke on the vehicles I've owned, and done some difficult (for me) task such as replacing a timing belt on a honda, and mcpherson strutts and a head gasket on a 4 cylinder SAAB.
I'm the new owner of a '68 F100 that was originally a 3 on the tree inline six. It's been converted to an FE390 with an automatic transmission (C6 I believe). It has an edelbrock 1411 (750CFM). I've recently got it running at idle of it's own gas tank. This is the list of work I've performed since getting it.
Replaced:
old gas
old oil
brake master cylinder
old dot3
plugs and wires
I also added 3-4 quarts of F-type tranny fluid.
Related to the Carb all i've done is removed it and dumped some carb cleaner in the bowls.
The Problem is:
Car starts and idles fine. When I drop it into any gear, the engine bogs down and begins to idle much slower. If i feather the gas pedal, or punch it, the engine dies.
I'm told that the carburetor had some components replaced (springs/jets) to make it run properly, so my guess is that it is closer to a 1407 now, just with electronic choke. I'm intimidated by tearing the carb apart and attempting to rebuild it, but I'm willing to do it if that's what it will take, I'm also willing to buy a new carb to avoid 12 hours of work trying to fix the existing one, but I'm afraid I'll have tuning issues beyond my capabilities even with a new carb. Also, the truck doesn't have a tach to assist in the tuning process.
I'd love to bolt something on and start driving, but I'm guessing it won't be that easy. Is it most likely a carb problem? Any recommendations on what I should do, considering my total lack of experience with carburetors?
I recently bought a 2006 STX with the 4.6 engine. Occassionally, when stopping at a light, the engine will stall. I took it to the dealer where I bought it and he put it on the computer and found that once on a test drive the RPM's dropped to 490, but it did not stall. He said everything checked out fine and thought it might be a carbon build up, since the truck only has 27,000 miles on it and was driven only around town. He suggested a couple of tanks of higher octane fuel and a fuel additive to remove the carbon.
View 10 RepliesWhy my 1995 f150 might decide to all of a sudden reverse the timing when i put trans in gear and step on the gas? would work well if it were supercharged. when idling in park, i hit the throttle it spikes to 10*atc then back too 15-25*btc, timing stays normal. when i put it in gear, brakes on wheels chocked, and i rev up the engine, the eec retards the timing and keeps it there! wtf?
View 12 RepliesMy truck will be running real good then all at once start missing so bad it shakes gear shifter,spits and pops and then goes back to running fine.
View 1 RepliesI have a '99 E-350 6.8L. Where is the check valve that maintains fuel pressure on the system?
I have been experiencing a starting issue when the engine is hot. Cold starts are usually fine. I've replaced the in-tank fuel pump (pump only, not the assembly) to no avail. I was out of town and didn't have access to a fuel pressure gauge when the problem started so I couldn't say what I had prior to replacing the pump. But now, with a new pump, when I check pressure, I get about 40 psi when I first cycle the key on, but it drops right back to zero as soon as the pump shuts off. If I cycle the key on a few times, sometimes I can get it to hold pressure at about 32 psi, and it starts fine. When I shut if off, it goes back to zero psi, sometimes gradually, like a bleed down, and sometimes immediately.
My conclusion from this was that the check valve was bad. I was told it was part of the in tank fuel pump assembly. Since I didn't replace the entire assembly, this made sense. So I just dropped the tank back down, but I don't see anything as part of the pump assembly that serves as a check valve. There is a rubber nipple on the end of the return line, but I don't see how that can hold any significant pressure.
So, before I go out and spend another couple hundred bucks on the complete fuel pump assembly, which apparently can't be purchased without the actual pump, I thought I'd ask. Where is the check valve that holds the pressure in the fuel system?
BTW, I also have replaced the fuel rail pressure regulator, but it made no difference (I went there first since that was much easier than dropping the fuel tank a second time).
I just changed the drain valve on the fuel filter bowl. All went well and no more leak, but now I am getting an "emission system" warning light.
After I replaced the valve, I filled the fuel bowl with diesel fuel. Was there any other priming that needed to be done (if any)? What the emission system warning light may mean?
2002 F250 7.3L 4x4.
When you are accelerating anywhere from half to full throttle it may cut out at any given time. The RPM will drop down, it may bounce up and down for a bit and recover, or it will drop all the way down and stall. If you let off the gas it may or may not recover. If it stalls so far from the tests I have done if you never shut the key off it will never restart again. If you shut the key off and wait from 5 to 10 minutes it will all of a sudden restart normally like nothing ever happened. If you try to restart it immediately even if you shut the key off and back on it will not start.
When it does not start when I am attempting to start: Fuel pressure according to my gauge is between 55 and 60 psi. Inline spark tester shows that it is getting a spark. Engine sounds normal while cranking so in other words compression sounds normal. I have an LED test light rigged up showing when an injector fires, and it does show electrical activity going to the injector when it opens (flashes). Only clue is that it SEEMS dimmer when it wont start, but I have no clue if thats how it normally is on start up. Its only a slight difference from the brightness of a normal idle brightness. I have a snap on scanner hooked up, nothing that I know of looks abnormal in the data and it will not throw codes when this happens.
Parts I have changed or cleaned so far: Changed the fuel filter, crank sensor, cam sensor, ignition module, and MAF sensor. Cleaned the throttle body. When the car is working normally it runs strong, good power, smooth. Starts great normally.