Cascade Crew

fiveoformula

that pretty much somes it up, the 'bird has been recently tuned up.
having trouble starting cold, pops on the service light after idling for a while (even at stop lights) then stops when you get to a constant speed, very rough idle. newer O2 sensor.
are these symptoms of the fuel pump going? stuck injector? Mad

this is the worst possible timing as i my tags are almost up

blue89 · Posted: Tue Mar 18, 2008 10:40 am Post subject:

Can you check BLM's? I'd start with spark first and then check fuel pressure. Sucks but at least its a new problem. Could be numerous things, but if you have good spark then it has to be fuel related.

fiveoformula · Posted: Tue Mar 18, 2008 9:01 pm Post subject:

BLM's

blue89 · Posted: Wed Mar 19, 2008 6:43 am Post subject:

Nevermind. Just check your ignition system and then check the fuel. Its got to be one or the other.

fiveoformula · Posted: Wed Mar 19, 2008 10:50 am Post subject:

does anyone know the best way to test fuel pressure on a TBI?

blue89 · Posted: Wed Mar 19, 2008 11:22 am Post subject:

Dewey should know. I've never owned one.

fiveoformula · Posted: Wed Mar 19, 2008 3:00 pm Post subject:

i had the car hooked up to our OBDII scanner today in auto-shop, it said something about the map sensor, couldnt read the whole thing before the scanner shut off... like out of batteries or something.
while i was in the datastream, it said something like BLM-yes
does that help any blue? I know im just stabbing in the dark

blue89 · Posted: Wed Mar 19, 2008 4:11 pm Post subject:

well if your map is off, that will definetly make it run terrible.

If your BLM's are shoved one way or the other you can get a better feel for whats going on. But you if you have teh capabilities to read it, you can just look to see what sensor is out of wack.

fiveoformula · Posted: Wed Mar 19, 2008 5:02 pm Post subject:

hmm. well i did pop in a different MAP sensor in, at class. it didn't change the way it ran.

Twilightoptics · Posted: Wed Mar 19, 2008 5:05 pm Post subject:

You need to get the scanner on it and see what reading the o2 is giving and likewise with the map and Coolant temp.

Sounds like the coolant temp sensor went out. Makes em run pig rich, if at all. Makes the ECU think it's like -39ºF.

I've never seen a regulator spike pressure up. You might check plugs too. Find out if it's just a handfull or one cyl vs all 8.

fiveoformula · Posted: Wed Mar 19, 2008 5:24 pm Post subject:

the 4 plugs i pulled out are black and dry... numbers 1,2,3,5 some worse than others and there only a few month old AC Delco's.
the OBDII read the correct coolant temp. between 200-215 degrees

fiveoformula · Posted: Thu Mar 20, 2008 9:01 pm Post subject:

so I think I've ruled out a spark problem.
on the scope at auto-class, the timing and spark looks correct when when showed across a graph.
I am really tempted to buy a couple re-man fuel injectors and see if that does anything. Bashy Bashy

blue89 · Posted: Fri Mar 21, 2008 7:22 am Post subject:

have you verified that all your sensor outputs are within their desired spec when the engine is warm? i wouldn't throw parts at it unless the parts need to be replaced anyway.

TecherB · Posted: Fri Mar 21, 2008 9:33 am Post subject:

have you check to see if you have a vaccume leak?
is your egr stuck open a little?
what kind of spray pattern does your injector have does it puls?

fiveoformula · Posted: Sun Mar 23, 2008 12:24 pm Post subject:

well i put out $100 bucks and got my self some re-man injectors and a new fuel pressure regulator.
they were definetly showing there age as the regulator had a pin hole leak and the injectors stream was abnormal.
I thought the problem might have been an EGR issue but it never threw the code...
now i am just gonna change the plugs because there black from all the extra gas. probably check the 02 as well.