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Engine lopes than dies sometimes

blackk5350

blackk5350

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past couple months its been real cold and when i start my truck it lopes like it has a big cam in it. today i was going about 5mph and it was loping. Throttle response was horrible then it just died. could this be fuel pump? or other things? what should i check first?

also radiator is leaking. anyone reccomend a nice aftermarket one for under 200 bucks? or should i go stock with napa or something.
 
Could be the fuel pressure regulator too,the diaphram in it can rupture and cause symptoms like a carb flooding will..doesn't always set a code either...
To see if its bad,pull off the vacuum hose on it,gas will pour out if the diaphram is ruptured...

I'd do a fuel pressure check too,in case it is the fuel pump itself starting to croak...it could be other things like a temp sensor or TPS switch,but those usualy set the check engine light off and set codes when they act up..
 
magik235 said:
Disconnect the vacuum line to the ERG and plug it. Does the idle get better?
Click to expand...
illl try it in the morning. its to late and cold outside ill piss off my neighbors and have the cops called again....:doah:

ill give it a shot tommorow thanks guys
 
CODE 44 - oxygen sensor out of range - lean condition

youve got too much air, meaning not enough fuel. what would i do...

1. new fuel filter - start cheap, this is inexpensive, and easy, and often fixes a fuel delivery problem on an old vehicle. did you run the tank very close to empty any time recently? gasoline is very dirty as a fuel, and leaves lots of deposites in the bottom of the tank. run it near empty, and you pick all that crap up. can clog a filter up quick.

2. fuel pressure regulator - if this has failed, youre not retaining enough fuel pressure to supply enough fuel to the engine to keep it running.

3. new fuel pump - not nearly as easy, may require dropping the tank. not sure how to test the pump before removing it to save you time and energy.

4. i dunno... fuel injectors maybe?

basically the fuel is hitting a restriction somewhere between the tank and the cylinders. the filter, pump, injectors, pressure regulator. all play a part in this system.

EDIT - OH and while its not normal for this to make the engine lope and stall, it could be a faulty O2 sensor, that is telling the engine its lean, and the engine is turning the fuel wayyyy up too rich to compensate for the false reading, and because its too rich, it stalls out. does the exhaust smell heavily of unburned fuel???
 
K5dreamer said:
CODE 44 - oxygen sensor out of range - lean condition

youve got too much air, meaning not enough fuel. what would i do...

1. new fuel filter - start cheap, this is inexpensive, and easy, and often fixes a fuel delivery problem on an old vehicle. did you run the tank very close to empty any time recently? gasoline is very dirty as a fuel, and leaves lots of deposites in the bottom of the tank. run it near empty, and you pick all that crap up. can clog a filter up quick.

2. fuel pressure regulator - if this has failed, youre not retaining enough fuel pressure to supply enough fuel to the engine to keep it running.

3. new fuel pump - not nearly as easy, may require dropping the tank. not sure how to test the pump before removing it to save you time and energy.

4. i dunno... fuel injectors maybe?

basically the fuel is hitting a restriction somewhere between the tank and the cylinders. the filter, pump, injectors, pressure regulator. all play a part in this system.

EDIT - OH and while its not normal for this to make the engine lope and stall, it could be a faulty O2 sensor, that is telling the engine its lean, and the engine is turning the fuel wayyyy up too rich to compensate for the false reading, and because its too rich, it stalls out. does the exhaust smell heavily of unburned fuel???
Click to expand...
ill do the fuel filter tommorow as well as my dang radiator.
funny thing is after its warmed up it runs like a champ. i can stomp on it and immediate power so its only very low speeds and 80% of the time when the engine is still cold. i was gonna take the EGR off and spray it out also and look at it. maybe theats it? gotta have this thing roadworthy by thursday. 4 hour drive no gas stations
 
K5dreamer said:
CODE 44 - oxygen sensor out of range - lean condition

youve got too much air, meaning not enough fuel. what would i do...

1. new fuel filter - start cheap, this is inexpensive, and easy, and often fixes a fuel delivery problem on an old vehicle. did you run the tank very close to empty any time recently? gasoline is very dirty as a fuel, and leaves lots of deposites in the bottom of the tank. run it near empty, and you pick all that crap up. can clog a filter up quick.
Click to expand...

The fuel pick-up in the tanks always draw fuel from the bottom anyways, the pick-up tube doesn't follow the float.. ;-)
 
i never ran it very low i always had it above Empty so i shouldnt be sucking up any crap. but ill try to get the fuel filter in tommorow.

should i replace the o2 sensor while im at it. its only 20 bucks i think?

whats the level of difficulty where does that damn black wire run to haha.
 
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Could be your MAP sensor. I disconnected mine once and forgot to reconnect it on my '92 Blazer with a TBI 350. Ran like crap at idle, like a lopey cammed big block. Smoked and coughed. Wanted to stall at lights. However when I got it over 1500rpm or so it roared back to life and ran like normal. Sitting or slow traffic it was horrible.

Might check that.
 
its not THAT bad. it will idle then go into that lope mode but its only when its cold. after it warms up i have throttle response and all!
 
blackk5350 said:
illl try it in the morning. its to late and cold outside ill piss off my neighbors and have the cops called again....:doah:

ill give it a shot tommorow thanks guys
Click to expand...

its loud?? you may not have enuff back pressure. i had 1 act like that running open exhaust after i put headers on...after pipes went on it idled & ran fine:waytogo:
 
it has full pipes running to the back so i know i have back preassure. i think its something with the fuel delevery. but it runs fine when warmed up
 
well, modern emissions controlled, computer controlled, vehicles have a warmup cycle that includes running the engine richer, and at higher rpm to warm it up to operating temp faster. the code 44 was for an O2 sensor out of range, reading a lean cycle.

Id go ahead and replace the fuel filter as previously said, and also the O2 sensor as its not that pricy on your vehicle. see what happens.

its possible the condition i described before of an o2 sensor giving a false lean reading, would cause the engine to add too much fuel to compensate for the false reading, it could be made worse when the vehicle is already running rich in its warm up cycle.
 
Do you have headers? I had to adapt a 4 lead heated O2 sensor into my system since the stock 1 lead O2 sensor wasn't getting to its operating temperature with my headers.
 
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