Check out the video. Basically, it responds to throttle but doesn't like to idle. In gear, if I add throttle it dies. No vacuum leak. $20 reward
#1986 Pontiac Fiero SE
obsidian magnet
Throttle response is just god awful
gentle tokenBOT
https://youtube.com/shorts/9a0X6q7deyI?si=k9grNf-hLrdy4NAj
astro.chemist
obsidian magnet
What if I make it interesting. I'll PayPal $20 to the first person to solve the problem.
swift coyote
fuel pressure is good, what about the MAF sensor or whatever equivalent the fiero has?
obsidian magnet
They've got MAP, the voltage readings seem fine on it
It controls fuel flow too maf doesn't exist on fiero so the good fuel pressure makes me think it's good
swift coyote
alrighty then, so the MAP is out. Have you checked the distributor/ignition coils and the ignition wires going to the spark plugs? What about the EGR? My miata had a clogged EGR valve along with a failed coil pack and i had similar symptoms (rough idle, wouldn't go above 30mph, would die at idle, etc)
obsidian magnet
EGR is deleted and blocked with a plate, and the entire timing system is brand new and in-time
I like your thinking though with intake. Maybe I'll check the TCS
obsidian magnet
TCS was off by like .2 v and has now been recalibrated. It helped a lot but not enough. You might be right about the MAP. I'll order one and see if it helps.
prisma pollen
EGR is deleted and blocked with a plate, and the entire timing system is brand n...
I know you said timing is new but have you checked spark? What have you done to any components related to the distributor or ignition coil?
obsidian magnet
New distributor, cable, Cap, wires, and plugs. I manually gapped them too. I manually set TDC then fine tuned it with a timing light
obsidian magnet
I can drive around town if I'm extra extra soft on the throttle but I get like maybe 10 HP
obsidian magnet
Gosh, it might actually be the map, the connectors cracked... I really don't want to buy a new one though. I'll put in the new connector tomorrow and a new O2 sensor tomorrow. If that doesn't help I'll order a new map sensor. If that doesn't help, I'm out of ideas.
prisma pollen
Yeah keep us posted, I’m curious
obsidian magnet
O2 sensor seems to have done the trick for the most part.
Still waaaaaay underpowered but I'm within reasonable margin enough that it's probably just tweaking things here and there + cleaning out the fuel system
prisma pollen
Hell yeah
obsidian magnet
Oooookay
So it started doing it again, and also when I filled up with gas a ton of gas just spilled from my gas tank itself?!?
I'm gonna replace the map cable and then I guess dismantle my entire fuel system with only 2 jack stands and a lot of luck
obsidian magnet
Map cable didn't help.
obsidian magnet
Alright I'm out of ideas again. I don't see how it could run perfectly after changing the O2 sensor then it just randomly decide it's not going to run well anymore without me changing anything
fierce shuttle
check the intake air temp sensor and the coolant temperature sensor (the ecu one specifically, the fiero has like three). they're used to calculate how much fuel to inject
obsidian magnet
Will do for sure.
obsidian magnet
Started going back to it.
misty raftBOT
GG @obsidian magnet, you just advanced to level 10! Chat more to level up and earn top roles!
obsidian magnet
All the sensors are replaced and new. Car won't start now.
obsidian magnet
Alternatively if anyone wants to buy this POS.
opal fjord
How much
obsidian magnet
Running and in good condition they go for 5-7 I'm thinking around 3k. The engines fine, I just don't have the skill clearly to deal with it.
Most sensors and parts are new. It's got a removable steering wheel in there too. Rust free frame
the thing is, ive had it run great before. then it literally just stopped doing that.
opal fjord
Running and in good condition they go for 5-7 I'm thinking around 3k. The engine...
Running? Didn’t you say it doesn’t start
obsidian magnet
I was saying that this car in good condition goes for that much if it did run.
But it doesn't so I'm discounting it 50%
opal fjord
Oh
obsidian magnet
obsidian magnet
Ok the fuel pump stopped coming on. So that's nice.