ok guys really need some help here. my 95 base is having troubles with the 3100... it bogs down sporadically and lately it seems like the problem is getting worse.

little background... car is a 95 base with 140,000 on body, 3100 auto. engine came out of a 94 z26 with 130K. car sat for 4 years until i bought it. ive had to really fix a sleuth of different things due to it having sat. the car ran PERFECT for about a year up until oh id say about 3 months ago. engine has taylor 8mm wires and new spark plugs, all of which was installed 10,000 miles ago. its got a custom intake i made with a k&n filter i keep regularly cleaned.

what happens... i can get in the car to head to work in the morning, fires right up, idles perfect. head on onto the interstate shortly thereafter and after a couple minutes i set the cruise control. then after a bit the engine bogs down and then picks itself right back up, maybe a second goes by throughout the whole process but it does it every couple minutes. and like i said the problem doesnt occur all of the time, just every once n awhile. it can happen idling down the street or doing 75 down the interstate. weather has no bearing, it happens in wet and dry conditions, and in cold or warm. the only way i can really describe the issue is its like your driving and all of a sudden someone turned off the fuel supply or the ignition source then back on again instantly.

what ive done to try and fix... first thing i tried was the fuel filter. it was nasty. i dumped it out upon removal and what came out was not pretty. black gas isnt good LOL. so i figured sure as @!#$ that was the problem, nope. kept on doing it. so today i tried an old coil pack assembly i had lying around from the blown motor that i pulled out. the ICM unit that was on the car had a cracked sensor mount so i figured that could be it, swapped everything out took it for a drive and the problem is still there.

i run E10/unleaded 89 octane gas in it, have ever since i started driving it a little over a year ago. ive tried getting gas from other stations thinking the gas might be the problem, as well as premium 92 octane, problem still remained.

and whats really weird is i can drive it for a week sometimes and it will run fine, the problem wont ocur. then after that it will do it for a week, then go away etc. its an extremely frustrating issue that i need to get fixed. its not like its stranding me anywhere but it gets annoying.

few more information tid bits... when it does it i can floor it and the car revs out just fine, performance does not seem effected one bit. then you go to settle it back down and bam, there it is again.

and my gas mileage is off quite a bit, last summer i could usually pull around 300-325 miles per full tank and average 30mpg on the interstate. now im getting 250-275 miles out of a tank and averaging 27mpg.

i used to get random check engine light codes for an egr issue, the light would come on and then go out after a bit. then i swapped to a z26 cluster and have not seen an engine light since. i am not sure if the cluster is working properly in this regard. no idea why. i have not scanned the car since the issue has arisen though... (i know, duh... i really should)

any advice or help would be greatly appreciated, i really hope it is not the fuel pump or the catalytic converter causing this issue. or hell.. something worse.

thanks, guys.



180hp in 1989 or 145hp in 2002, you decide. >

If it has the egr with a vacumm line disconnect it and leave it unhooked.If the issue goes away that is the problem.Unless I missed something I will think on it in the mean time.Getting ready to crash out for work and short on time to think on it for a reply.Ok

yeah, i dont recall it having a vacuum source but i certainly could be mistaken.

i'll check for it tomorrow, im planning on cleaning the whole system up soon as the more i think about it the more my problem points to the EGR. i just dont quite get how the EGR would effect output of the engine like that...



180hp in 1989 or 145hp in 2002, you decide. >

crank sensor maybe ?

Post a video on youtube and provide a link to it ... it would be alot easier to diagnose something if you can hear/see it IMO

one mans bog is another mans sputter .... and so on

i dont think its that big of a deal but why move this? its maintenace. thats where it belongs IMO. i realise its not j-body specific but jeas. i dont think its that big of a deal.





180hp in 1989 or 145hp in 2002, you decide. >

Well the egr can choke the shiat of the engine! I would remove and clean and then look to the cat since a map,or maf sensor are not out the pic but,I would start simple.Unless you have a injector dieing you have start checking ohms at each injector for failure.But based on the issue it sounds more like emissions problems blocked passages or flow to me.The sensor thing is not totally a possible just something that came to mind.

it was the EGR. i had it scanned and all three EGR solenoid codes were thrown.

i unpluged it, im seeing a smoother idle and 200-300 rpms less on the interstate. and yes... the problem has ceased!



180hp in 1989 or 145hp in 2002, you decide. >

Glad to see my recommend panned out.It really did not suprise me it was the culprit.If you clean it up it may be fine,unless the rubber diaphram inside is losing vacumm (which is what happens) and causes the problems u had.I would prolly buy a new one.The only change is what u see now and maybe a little mpg lower maybe.At least it did not cause a migraine forever.

im already seeing increased fuel mileage as well. my current tank is at 140 miles and its at 3/4.



180hp in 1989 or 145hp in 2002, you decide. >

did ya try the Beretta sites ?


ShowOff Customz
03 Cavalier
73 Beetle
68 Fairlane 500

well this problem is still here.... 6 months down the road. i dont know wtf to do, im at my witts end with the freaking piece of sh!t.

ive since tried:

unplugging EGR, new EGR, EGR block off plate
cleaned TB and new TPS, cleaned EGR passages
big 3 wiring upgrade with plenty of good grounds
sprayed carb spray over all the engine vaccum lines etc, no abnormal issues or leaks

i cannot @!#$ find this problem, everything i try... nothing works. and it seems like the problem is getting worse. i wish the SOB would just die already so i could find the cock sucking problem.

any ideas?



Underdog Racing

have u asked anyone on any of the 2 beretta sites ?


ShowOff Customz
03 Cavalier
73 Beetle
68 Fairlane 500

yes.



Underdog Racing

did u try anothing fuel related, like the filter or maybe the pump ? if its bogging down its gotta be fuel related, a EGR wont bog the motor down. egrs are just for exhaust gases. maybe the car is clogged i know that will bog down a car.

maybe some one on 60degreev6.com could help since its a 3100


ShowOff Customz
03 Cavalier
73 Beetle
68 Fairlane 500

fuel pump?



** FOR SALE** http://www.j-body.org/forums/read.php?f=24&i=110879&t=110879

Fuel Pump.

Mine old 3.1 did pretty much the same thing before it gave up the ghost...

Agreed your engine should have the schrader valve to check the psi! Unless if the cat is way old it can be restricting air flow.I would at least check ur fuel pressure,and second cut the cat off and run straight pipe temp.If your cat is over 5 yrs old I would pull it and check it.I def would cut it off and heck the upgrade to a new one bolt in want burn holes in ur wallet.Start simple,then even a map sensor could do this,wires, plugs who knows.Do the simple things first(in alot of cases it is the cheap stuff that fails).

lol i have been doing the cheap stuff. i forgot to add, the very first thing i tried was the fuel filter. it was nasty and heavy but it had no effect on the issue.

anyways, what leads me to believe its not the fuel pump is the fact that when it does this 'bogging' i can put my foot to the floor and it runs just fine. then when i let off, the problem comes right back. anytime u beat on the car its fine.

as far as the cat goes, if it were clogged, wouldnt it be clogged at WOT too?



Underdog Racing

i dont know . im stumped


ShowOff Customz
03 Cavalier
73 Beetle
68 Fairlane 500

me to

its going to the local mechanic for diagnosing this week sometime.



Underdog Racing

That damn car has cost you so much more than it is worth. Hope you get it figured out.

Are you getting false knock? Could be causing the car to pull spark or fuel.

Trevor Blesh wrote:That damn car has cost you so much more than it is worth. Hope you get it figured out.

lol i originally only paid $160 for the damn thing! its the fact the damn thing sat in a field for 4 years before i bought it that im paying for

brian - no idea, with OBD1's limited diagnosing ability im up @!#$s creek



Underdog Racing

Try fuel pump or even the pump wiring maybe, could be a short causing the pump to cut out. Could also be injectors. I dont think it would be the cat because that would most likely cause the car to bog under acceleration.

ok new development... i guess its something i never noticed before? (fail) another thing... its no longer a random, intermittent thing. it does it EVERY time now, every day.

it runs fine UNTIL the engine gets up to operating temp. only then does it start doing this stalling issue. so basically, when it goes into whatever loop it hates it.

so, 02 sensor perhaps? can i unplug some sensor (iat?) to keep it from going into the operating temp loop?



Underdog Racing