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Author Topic: My first Fiero...Somebody help me.  (Read 1104 times)
Xanth
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« Reply #15 on: April 20, 2008, 04:41:36 PM »
Given fuel injector cleaner a try yet?

Just throwing out ideas at this point.
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If any car is both the parade and the rain, it is the Fiero.
reddog1971
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« Reply #16 on: April 20, 2008, 04:58:21 PM »
Yup,1 bottle in the tank with 5 gallons of fuel,no luck.I do appreciate your help with this mess and I'm sure it will work out it's probably one of those silly little things that takes 2 seconds to fix and 2 months to diagnose.It is what it is.
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Xanth
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« Reply #17 on: April 20, 2008, 05:04:44 PM »
As a last ditch effort you could try swapping the ECM, I spent months and hundreds of dollars on my Formula replacing parts and sensors to fix a running issue.

Replaced the ECM on a whim and the car suddenly ran perfect. Unfortunately I don't believe there is any way to isolate the ECM as the issue, just a swap it and see type of deal.
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reddog1971
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« Reply #18 on: April 20, 2008, 05:13:11 PM »
Any idea on what would cost.I have heard they can get high dollar and I'd hate to drop a ton of $$$ to find out it wont help.I just read on pff that a gent was having similar trouble swapped out his o2 sensor and cured it.Is there a test for the o2?
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Xanth
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« Reply #19 on: April 20, 2008, 05:29:27 PM »
I got my ECM used for only $15, you can find them on ebay as well. Rebuilds are quite a bit more.

For the O2 sensor, you can test it with a volt-meter. The voltage from the O2 sensor should vary quickly between 0 and 1 volts once the engine is warm and running.

IIRC , you just set the multi-meter to Volts DC and connect your positive lead to the O2 connector and the negative lead to ground.

If you haven't already replaced it its probably worth doing anyway. I believe Denso is the recommended brand, Bosch is known to have issues.
« Last Edit: April 20, 2008, 05:31:00 PM by Xanth » Logged
If any car is both the parade and the rain, it is the Fiero.
reddog1971
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« Reply #20 on: April 20, 2008, 06:26:09 PM »
I think I'll get the O2 tommorow and try it first.I also found a few ecm's on ebay so if the O2 dont do it then I'll grab one up.
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reddog1971
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« Reply #21 on: April 22, 2008, 07:48:40 PM »
Ok it's been a couple days but I have been bustin hump at work and have 0 time to spend on the car.I would like to say I have an update but I dont.I am picking up the O2 and TPS tommorow and slappin them on and gonna give it a go.I will update 2moro.
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Xanth
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« Reply #22 on: April 23, 2008, 07:06:30 PM »
Hope one of those takes care of it, if nothing else you'll have a whole lot of new components on your car.
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Black86GT
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« Reply #23 on: April 25, 2008, 06:22:45 AM »
Xanth may be on to something. A blocked cat can cause stumbling issues too. My first fiero was a duke. The spray pattern should be consistent btw. It should tighten up a bit but not to the point of a stream. The injector might be screwed up and not atomizing the fuel correctly. If you have a bad injector and a partially clogged cat the lack of proper fuel atomization and the engine choking due to the clogged cat might be the issue.
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reddog1971
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« Reply #24 on: May 01, 2008, 05:23:54 PM »
Nothing new to report,just too damn busy.I havent had time to go out and fire it up.Maybe someday next week I can get something done.
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reddog1971
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« Reply #25 on: May 18, 2008, 07:40:27 PM »
Ok new update.Installed a new o2,tps and fuel pressure regulator.Absoloutly no difference.I guess throwing new parts at it aint the answer either.So any suggestions are welcome.
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Xanth
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« Reply #26 on: May 23, 2008, 12:32:02 PM »
Sorry for the delay, been busy and neglecting the site  Cry

Do you have a compression tester? You could try checking the compression across the cylinders and see if they're close to each other.
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reddog1971
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« Reply #27 on: May 23, 2008, 06:02:55 PM »
One of the first things I tested was compression.Highest cylinder was 128, lowest was 123.I am starting to wonder about the coil packs.They look old and are cracked in spots.Could it be them causing this kind of trouble?The car still acts like way too much fuel not being burned in the cylinders and it smells more rich than normal.Maybe I'll throw some more money at it and buy some soon.I'ts only money right?If nothing else it will have a bunch of new parts on it when I'm done,lol.
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Xanth
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« Reply #28 on: May 23, 2008, 06:17:48 PM »
I can't be certain with my limited 4cyl experience, even less so with distributor less systems.

Worth giving a shot anyway.
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reddog1971
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« Reply #29 on: May 27, 2008, 05:10:19 AM »
Ok I'm stumped.New coil packs didnt do it either.I am out of ideas.
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