Carbon buildup on new injector pin caps (Page 1/1)
rjpeek MAR 24, 06:39 PM
Last year I bought a 1986 Fiero GT 2.8l for $800.00. It did not run at the time but would start while spraying starter fluid. The seller replaced the fuel pump which I confirmed using a fuel pressure gauge connected to the fuel rail. I discovered the injectors were clogged Clogged Injector. I replaced the filters and pin caps and tested they were operating correctly. I have only started it a few times while chasing down other problems (leaking radiator, rough idle, stuck IAC valve, etc...). Currently I'm chasing down vacuum leaks and think it's leaking where the EGR Tube connects to the upper plenum. At the same time I'm going to replaced the valve cover & upper/lower plenum gaskets. During disassembly I removed the fuel rail and noticed the carbon buildup on the new Injector Pin Caps. Any ideas why so much carbon in such a short amount of time?

[This message has been edited by rjpeek (edited 03-24-2019).]

fierofool MAR 24, 06:52 PM
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fierosound MAR 25, 10:22 AM

quote
Originally posted by rjpeek:








That looks more like rust/sludge being pumped from the tank.
You'd expect the filter to catch it all - but...

I think the tank needs to be dropped and cleaned, the fuel lines flushed and a new fuel filter installed.

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[This message has been edited by fierosound (edited 03-25-2019).]

fierofool MAR 25, 12:20 PM
Georgia Fieros had a car that ran well, then suddenly developed a bad miss. After replacing the fuel filter a couple of times, we finally got into the injectors. They were plugged at the top with a super-fine powder that looked just like that. It warranted full set of new injectors, a new fuel pump and sock (2nd one) and replacing the tank even though it had been flushed when the first pump was installed. The car had not been driven more than 100 miles with the first pump, sock and filter.

When we replaced the tank, we found it to be full of what appeared to be muddy water, the rust being so fine. You might be in for a tank removal and flush. Check your fuel filter and see what comes out of it.