1986 Fiero SE Won't Run (Page 4/7) SemperFi18 OCT 08, 03:08 AM Also, have you replaced the vacuum lines with a stainless set or are you still running plastic? Those lines if original are almost guaranteed to have cracks 72and86 OCT 08, 10:24 AM quote Originally posted by Patrick: What is it... and how quickly does it drop when power to the fuel pump is cut? Dont have a gauge. When we pressed the valve with the tip of a screwdriver, fuel came spraying out like a gieser. But I just ordered a gauge tester on eBay 72and86 OCT 08, 10:30 AM What is this tube thats open directly below the wire cluster? Its against firewall left side (drivers) in back of V6 engine, My mechanic says its nothing, just a vent, possibly fuel return vent. Patrick OCT 08, 12:47 PM quote Originally posted by 72and86: What is this tube thats open directly below the wire cluster? About once a month someone asks about that pipe. Relevant thread Here. quote Originally posted by Patrick: Hopefully that pipe was disconnected from your air filter canister during the recall (and the canister hole plugged), otherwise that uncapped pipe has been allowing outside unfiltered air to enter into the filtered side of your air intake system all these years. buddycraigg OCT 08, 09:02 PM quote Originally posted by 72and86: Well the latest in the saga. Cleaned out the entire plentum and EGR port (see pic above). Checked EGR tube; spotless Replaced TPS Replaced Coolant Sensor Removed cat and checked it. Still same result, nothing changed. Car starts hard, runs a few seconds and dies. As before it can run if someone is constantly feeding the throttle. But let go and it dies. Running out of things to replace and nothing seems to improve it. Stop buying stuff. We need to diagnose the problem. I cannot help anymore until you tell me what happened when you tried to make it idle with using your finger over the hole when you took the IACM out. 72and86 OCT 09, 10:39 AM quote Originally posted by buddycraigg: Stop buying stuff. We need to diagnose the problem. I cannot help anymore until you tell me what happened when you tried to make it idle with using your finger over the hole when you took the IACM out. OK. The IACM is at the top of the throttle body right? To do the test does it matter if its wiring harness is connected? Thx 72and86 OCT 09, 12:00 PM Ok the latest saga. I got 2 gallons of fresh gas and added it just in case. (When we changed fuel pumps, all of a sudden the gas gauge is not working right now and pegged on full! WTF?) Anyway the addition of fresh gas made it start and surge and hunt a little and die. Before it would only start and die. This is what it did before we replaced the fuel pump. I tried jumping the 2 ODB ports with a paperclip and the engine wouldn't even start. Just cranked. I removed the paper clip. I tried it. It started and ran! First time in 3 weeks it actually ran without my foot nursing it on the gas pedal. It idled little rough but idled at 1500. Whoa, I thought, progress. BUT... Then I remembered OMG!, that I put a rag in the throttle body to keep the critters out at night. I got out of the car, I pulled out the rag and idle surged way high, it quickly idled erratic and it died. This must be a clue. Later with my mechanic we will try covering the IAC. I need an assistant. buddycraigg OCT 09, 01:27 PM The IAC is the thing you had a picture of them side by side. DO NOT HAVE IT PLUGGED IN. If it wants to shut down the flow of air, it will push the plunger forward until it falls out. How much old gas is in the tank? How old is the gas? Rexgirl OCT 09, 03:27 PM I am also wondering if your cold start tube (#5 in pic) is okay and not leaking? It connects under the throttle body and feeds the intake manifold. Patrick OCT 09, 04:59 PM quote Originally posted by Rexgirl: I am also wondering if your cold start tube (#5 in pic) is okay and not leaking? It connects under the throttle body and feeds the intake manifold. "Cold start tube"? Doesn't that tube supply air that's been controlled/regulated by the IAC valve?