Whizbang

I was driving back from toledo to cleveland and along the way the car started to randomly buck like it missed real bad. just for a sec. I had cruise on at this time. Then it started happening more and more during the trip. then i had to get off cruise. and it became more violent and longer turns. until i could barely stay at 60. And it was worse on hills, i believe due to the increased load. Then about 20 miles from home the car basically was underdriveable and i pulled over. with the car running i popped the hood and saw the PD spraying gas everywhere. so i shut down the car and got it towed.

so today i replaced the PD by bypassing it completely. No leaks after checking w/ the pump on. car fires up nice. idleas. but again, you can barely drive it. wtf! i figured that the PD shooting gas was the problem. but i guess not. It seems like the car isnt getting fuel passed 3-3.5k under no load. because it just stumbles on itself. and you can BARELY drive the car. and not up inclines.

here are my suspects:
-TPS --> going to try a known working one tm.
-Injectors --> they where leaky or at least the car was running quite rich before.

but other than that im really not sure what could have went out. the motor has very good compression so its not that (thank god) but what is it?

GavinJuice

i would first start with the TPS and make sure thats setup properly. not sure if any failure with the PD relates to anything else failing before it. i would check fuses and make sure nothing was popped, as with electrical under the TB. put a fuel pressure guage on your send and return line to see what the difference is, if there is one.

Whizbang

any other ideas?

Max7

It starts, idles and runs fine other than above 3-3.5k? Fuel filter, pump, AFM, and TPS can all be suspects.

64mgb

iTrader: (1)

What's a PD? I'd check the fuel filter.

Rich

frisbeedog

I think the PD is the pulsation dampener. I could be very wrong though. Maybe clean the throttle plates really well. I cleaned mine this weekend and it seemed to make my idle surge more than before I cleaned it. There may be some dirt in there causing the surging.

Be sure to let us know because every little bit of knowledge helps when it comes to the FI GSL-SE.

Whizbang

the fuel filter is spanking new. the PD = pulsation dampener and i just bypassed the thing. But that might not be a direct cause of this problem. it just started to happen. im thinking TPS. so im going to try that out today. The tb is very clean...like scary. and this is too major to be something retarded like that.

Max7

I wonder if one of the 6 ports was not working, and it would cause such an uneven power from front rotor to rear, could this cause some problems?
just throwin out ideas.....

diabolical1

iTrader: (3)

TPS or maybe the fuel pump is about to exit?

what do your plugs tell you?

Whizbang

the pump is new too. thats why im thinking TPS.

Feds

Definitely do the idle checking prcedure, but it may be worth while to re-replace the fuel filter, or at least check flow coming out of the hardline.

Whizbang

i would so pissed if the new filter got clogged already...lol

GavinJuice

duh, i didn't think of this before but the PD is there to smooooooth out the pulses of the fuel pump pushing the fuel through the lines. other wise your essentially getting imbalanced pressures to your injectors, and one rotor to the other.

might be a good idea to replace it, then trouble shoot from there if it doens't fix your problem.

Whizbang

ive bypassed it before with no issue. ill try to check the fuel pressure later today to see if its stable or not. but regardless, the pulses shouldnt be enough to cause the motor to be almost undriveable.

GavinJuice

oops

Max7

Or maybe. with the old injectors, that extra pulse now over powers the worn out injectors and is causing a riching of the mixture. I recall reading somewhere that without the PD it can wear out injectors sooner? maybe not. so many things to look at, so little time. Have you made up a TPS checker yet? they are easy to make.
Keep at us. we will figure it out if it takes all year

Whizbang

so yeah. i feel dumb. the main hose to the pump somehow kinked itself. ??

so it runs great. but now the fuel gauge stopped working lol.

PaulFitzwarryne

I know the feeling, but I don't mind being foolish if in the end it does not cost anything! Recently I had an intermittent fault, checked everthing electrical and fuel system without luck. Two days later found it, a`loose connection on the anti-theft so everytime the car went over a bump it thought it was being stolen and switched off.

Its great you are back on the road again. Perhaps Gen 1s have their own breed of gremlins.