From a still position (like a turn lane or coming out of a parking lot), I give it some heavy throttle, and car bogs down....then it catches up and it's fine.

Now it doesn't do this when it's just a hard turn in the road; only from a still starting position.

What's going on? My father mentioned something about fuel bowls, but I don't know...????

Help.

-The Gunny

 

Could it be the extra strain on the engine because of the turn. Kinda like if you try to push a car with the wheels turned-it's much harder than going straight. I know I need to give my car more gas when at a dead stop and turning sharply. I have a manual, but the same rules apply. Has it always done this or did it just start?

 

It just started this about a week and a half ago. Hell, sometimes it will just straight up shutter on me.

I need to diagnose this quick, because I have to go on a trip Sunday.

-The Gunny

 

Things that can bog a car down:

Too much oil, hard cornering would toss the oil against the pistons creating some backpressure creating a bog.

Clogged PCV, same applies air can't move freely b/w the chambers adding backpressure.

This is back in the old carb days.. too much air? Not enough fuel to compensate for increase in air causes bog or hesitation.

The last one is a likely problem if the fuel pump is on its way and can't give enough gallons per hour. Low fuel pressure in general.

Anyways, I'm just taking a stab at it the other two I was remembering reading on how they designed the LS1 engine, it had those issues in its intial design phase during testing.

 

Nah fuel bowls are on carbs.

Are you sure your gas tank isnt at 1/4 or less when you're doing this?

 

Positive. That was my first thought as well, but I filled up my tank and tested it, and it still did it.

.....fuel pump located in the gas tank?

 

That sir is correct.

 

Try checking the timing to ensure its ok. Then if it is, try backing it off and see if it still does it.

 

Timing is advance 8*....

...how hard is it to change the fuel pump? At local parts store the an AC Delco pump is $42.

When I called Pep Boys, they quoted $393 for parts and labor

 

Requires dropping the rear clear out and removing the the back half of the exhaust to allow enough room to get gas tank to drop out. you might as well put a $100 Walbro 255lph pump in there instead of a wimpy stock replacement. The Walbro pump will fuel as much horsepower as any daily driver would need. Pump can be changed out in a nice long saturday when the car is very low on gas. Its just time consuming not overly difficult.

 

Walbro pump eh? Do you have a part number and place to get one?

And isn't there other parts to the fuel pump as well? Something like a strainer or screen of some sort?

 

sounds like the fuel pump may be on its way out. Ive had the pleasure of changing the pump 4 times. The strainer comes with the pump its pretty straight forward.


in addition to my car stalling and refusing to run after about an hour of continuous driving being a sign, it also bogged and stalled easily on turns. I replaced the pump with one for the late model vortec trucks.. look in the fuel pump catalog at the parts store its the gm intank one rated atl ike 36 psi and 42 GPM.

The car never ever bogs now

 

http://www.jdsperformance.com/index....1&fcmd=manlist

Very last one on the page. WAL255C and it comes with a new screen.

 

Thanks guys. Another problem that I discovered yesterday was that the voltage for the MAP Sensor seems to jump back and forth a little while under acceleration. Do yall think that might have something to do with my problem?

 

Did you clean the connections on the MAP sensor while you were messing with it?

 

No. I had a friend hook up that computer thing so we could do some testing, and that's when we saw, but I haven't fixed it or touched it just yet. I'm supposed to go to a shop here in 30 minutes, and the local Chevy expert is going to drive the car around and see if he can find out why I'm bogging.

 

It sounds just like what happened to mine when I accidentally burned the wrong BIN file to my prom and the car ran too lean during testing. I would bog everytime I hit the throttle. A weak or dying fuel pump will have the same effect.

 

a replacement pump is a good investment. Our pumps were notorious for dying due to running low/hard cornering.

The only problem is that changing it is a real PITA.

Given the choice between changing headers and changing the pump, I'd change headers in a heartbeat. Headers with a/c and air tubes in the way too...

That's just my experience with my fp change, hope yours goes well if you do it.

To check a pump is actually kinda easy, first the techs will do scan of the pump, current draw vs time, then check flow rates, GPH and pressure.

Mine just decided to give out one day, I filled her up, got home decided it was time for a coolant change and it died while I was doing it. I kinda wish it had the symptoms you guys have instead of just keeling over like it did, then I would have had some warning.

 

Well, off to the shop I go (bye bye $60). I'll let yall know what he says.

 

Well, after consulting the mechanic, (before any money was spent); I just went and bought a MAP Sensor from Autozone ($28). It took me all of 1 minute to put it in, so then I returned to the mechanic. It seem to fix the problem I was having, but I let the mechanic take the car for a test drive, and he saw no reason to to do anything else to the car.

However, I still feel a little uncomfortable with the whole situation. I still don't see how the MAP Sensor would cause a problem JUST in hard turns from a stand still. It seems to have fixed the problem, but I'm still nervous about my 11 hour trip coming up.

 

Perhaps under extreme loads the map sensor being faulty couldn't give the ecm the proper readings thus giving you your bog.

Hey, if it's fixed, who's complaining?

 

thats an easy on if you are making a hard left the car is running out of gas

 

Did any one think of the wireing right by the trans, there is a service bullition on the wiering in the harnes behind the distributer.chewed up the wiering causeing rough ideal and driveing problems.

 

Well the problem is coming back a little. It seems to only occur when in a left turn. And yes, the tank is full.

Could you elaborate a little more please? Was there a recall for this particular problem? And what kind of "driving problems."

 

it didn't really say what kind of driving problems other then it would bog out some times, there is no recall from what i know,there is just a gm service bullution on the car i looked it on the computer at rizza chevy