need help !!!

Topic: need help !!! (Read 2581 times) previous topic - next topic

need help !!!

June 29, 2008, 10:23:41 AM

this is the deal,,,,put in my 255walbro pump last saturday, evrything went fine except the gasket where the fill tube goes into the tank(gasket was toast)other than that the car ran great. Then friday she would start up run smooth for 10-15 seconds then hardley idle up/down/up/down then try to die like it wasn't getting enough fuel,but when you drove she runs fine, good pick up, nail it and she is gone until you start to come to a stop then she bucks and wants to die.
Checked fuel pressure (40with vac off),tps (98.8),cleaned iac even tried another one,timing (16*where its always been) reset idle and eec, still nothing. So i ran codes and come up with #33 and #94.
Got any suggestions???????????

Thanks, Joe

need help !!!

Reply #1 – June 30, 2008, 08:44:27 AM

anyone got any ideas??

need help !!!

Reply #2 – June 30, 2008, 08:51:48 AM

Egr sticking open??
Don't have my codes beside me,what are they???

need help !!!

Reply #3 – June 30, 2008, 12:29:33 PM

codes were---#33, EGR not opening properly,,,#94,air diverter circuit fault
could one of these maybe be it??? and if so what is the air diverter valve?

need help !!!

Reply #4 – July 01, 2008, 09:32:01 AM

Also, the day before this all sarted the car got kinda hot (up towards red) while i was taking my son to get his hair cut, so friday i put a new thermostat in. That evening/saturday morning is when all this started with the funky idle wanting to cut off etc,etc

thanks for any suggestions

need help !!!

Reply #5 – July 03, 2008, 05:52:12 AM

any ideas??

need help !!!

Reply #6 – July 03, 2008, 08:07:02 PM

Is your car still getting hot? And i would run a piece of vacuum hose to the EGR and check if it opens all the way and holds open,(check jcassidy's thread on how to test the EGR valve). I would also pull the EGR valve off and check for carbon deposits as well. Dont quore me but I thing the air diverter is the pipe going to the catalytic converter? I believe there is some kinda solenoid that switches or something. Also last but not least, try to run your car with the gas cap off, this will tell you if you are having a ventilation problem in the tank.

need help !!!

Reply #7 – July 03, 2008, 08:09:38 PM

Oh yeah. Incorrect fuel pressure at the rail can cause all sorts of issues. Make sure your fuel pressure regulator is not malfunctioning. Check for cracks at the vacuum line going into it. Vacuum problems or open lines anywhere on the engine can cause idiling issues.

need help !!!

Reply #8 – July 06, 2008, 11:29:33 AM

thanks for the reply,,
#1--car is not running hot anymore
#2--I will try the EGR vacuum and check for deposits and such
#3--the fuel at the rail is reading 40lbs (vac off ) wasn't touched after i had put the pump in. IS THERE ANY OTHER WAY TO CHECK THE PRESSURE????,
also if i get the rpm's above say 1100 it will run fine, i can rap it up and so forth while it is still cold, when it starts to get warmit is harder to keep running.
Do you think the ACT sensor or the ECT sensor could be causing these symptoms? or would there be a code for these if they were bad?cause the only codes i got were the #33-(KOER)and the #94 (KOER) no codes for KOEO except #11.
I haven't messed with it for a couple days but turned the key yesterday and she fired right up, ran fine (high idle-1400) for about 15-20seconds then went down to 600 or so but ran like it was only running on a few cylinders(or not enough fuel) but once i gave it some gas she would rap right up smooth.

Thanks again for reply's

need help !!!

Reply #9 – July 07, 2008, 05:37:44 AM

Ok,, tried the EGR vacuum----held vacuum
took EGR off and cleaned (wasn't bad)
took gas cap off ----no change
new fuel filter----no change

for some reason i think it is fuel related, but once she starts to get warm it's like she can't get enough fuel, even when i try to rap it up a little.
also she will run(rough) for a little while when cold but once she starts to get a little warm she will die, fire her back up and she will die!!

I am STUMPED!!!

Thanks again for replys

need help !!!

Reply #10 – July 08, 2008, 12:28:29 AM

Ok well I hate to throw suggestions out to you and have you spend a lot of $ on hunches and the sort but, It sounds as if the EGR system is malfunctioning in some way. Now that you determined that the EGR valve is good, you have to determine if the solenoid and vacuum line that run the EGR is operating properly and you have no vacuum leaks, that sounds like the culprit here, especially the idling issue. Now the diverter valve I believe may be on the same circuit as well, so a vacuum leak in that general area could be it. THere are 2 solenoids next to eachother, thay look like salt and pepper shakers. Look at the vacuum connectors coming out the back, are they cracked, the best way to determine this is start the car, let it idle (the best it's goona do anyway), spray soapy water all over the vacuum and the solenoid areas, see if the idle comes back up. Your codes are telling me that this area is where to start looking. Hope this helps, good luck!

need help !!!

Reply #11 – July 08, 2008, 12:33:38 AM

BTW, yes 40lbs sounds good, rap the engine in park, watch the guage as well, ECT AND ACT will both cause your car to act strange too (many Tbird SC's in my past). But yes the 5.0 needs ECT to detemine proper timing and ACT to determine A/F mgmt. But if your car's not throwing those codes, doubt it's an issue.

need help !!!

Reply #12 – July 08, 2008, 06:02:26 AM

Thank you for the input, I will check these areas you've mentioned this evening,,,,,,I had my wife start my car while I watched fuel pressure, started at 40 then after a couple seconds the car started acting up and the pressure went up to like 45. Just for the hell of it I checked my plugs and the were BLACK as BLACK could be,,,,,,,they always ran CLEAN. so I put some old but good ones in just to see if there would be a change,,,Nothing!!
A friend of my brother-in-laws said to check my TFI module so I will check that also this evening with an old but known good one.The reason i asked about the ECT/ACT is because this all started after my car got hot(close to red) the day before,,thought maybe they coud have gotten fudged up because of the heat??
Any other suggestions PLEASE, PLEASE throw them my way...........

Thanks

need help !!!

Reply #13 – July 08, 2008, 02:46:16 PM

Well ECT would cause more of the issues than the ACT, ACT is Air Change Temp, It looks for changes in the incoming air through the intage to adjust proper air fuel curb. ECT looks at the engine coolant to do the same thing. These normaly wont send a code unless checks bad or out of range. If no codes to these two, they are in range enough to not cause the issue your having. Im thinking vacuum related, TFI possibly, or bad FPR fuel pressure reg. But than again if you have a massive vacuum leak, it can throw off the FPR and the solenoids for the EGR and the diverter unit as well.

need help !!!

Reply #14 – July 08, 2008, 08:33:57 PM

First off,Thank you for replying again, I appreciate the help and suggestions that you have given so far
,,,,,,,,,,,Just put in a old but good TFI--NO CHANGE!!!!!,,,,also i have been doing some searching on here about fuel pressure and i have noticed that as soon as i turn my car off(like it stays running for a long time)my fuel pressure gauge drops within a few seconds?? never checked/or noticed this before,,,,shouldn't the gauge keep it's pressure for a while longer than that? I have a new ACT sensor that i never put in since the HO conversion so i was thinking about puting it in just to check!! The ECT sensors are what?-$20.00, I just don't want to spend money that i don"t need to spend.
I am so thinking that is fuel related somehow!! I can keep it running by feathering the gas and keeping the RPM's up. I have/had my old regulator but i have not been able to find it yet(just seen it the other day). For tomorrow i am going to try some soapy water?/wd40?/fuel inj.cleaner to see if i can find some kind of vacuum leak and maybe chande the ACT sensor. I got two young(5 & 12) kids that i need to try and keep busy!!!!!!!!!!!!!!!!so it's kinda hard sometimes for me to just go at it.
I thank you again for trying to help me with my situation, I got to try to get this thing going by the end of the month for inspection, PLEASE stick with me.
Thanks, Joe