1986 Pontiac Fiero To Much Gas

BZ4090

MEMBER
1986 PONTIAC FIERO
4 CYL
2WD
MANUAL
97,350 MILES

I have a 1986 pontiac fiero 2m4 and im stuck on a problem that I could use help with. The problem is that I have got the car and it hasnt ran for 5 years and so you could imagine it would be hard to start the first time. The problem is that the Throttle body injector shoots to much gas when trying to start it, so it floods the car before it can ever get started, what is causing it to shoot so much gas. Help would be much appreciated.

6 Replies

BUDDYCRAIGG

MECHANIC
2,262 POSTS

No offence but, I doubt that it’s getting too much gas. I know it probably looks like a toilet being flushed, but they normally look like that.

Have you checked for spark?

Here’s something else to check for, (I know it sounds crazy)
The cam gear is not metal and can strip a few teeth, and the cam doesn’t turn.
Take the oil fill cap off and watch for the rockers to move while you have someone else crank the engine over.

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Saturday, December 6th, 2008 AT 6:08 PM

BZ4090

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4 POSTS

Well I took off the oil cap and the rockers are still moving and I check all and replaced all of the spark plug wires along with the cracked throttle positioning sensor. But still cant get it started. The reason I thought it was to much gas was because of the back fire of the throttle body. So I was thinking could this be the result of the timing chain. Tell me what you think. Thank you very much

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Tuesday, December 16th, 2008 AT 3:06 PM

BUDDYCRAIGG

MECHANIC
2,262 POSTS

Mmmm.
A back fire is normally a sign of too lean (not enough gas).

Does the injector spray look like a nice cone shape? Like from a windex bottle.
Or
does it just kinda dribble out?

If it dribbles out then you've got low fuel pressure.
Or the injector is dirty.

But since it sat for so long, i'm going to bet that it's a little rubber hose inside the fuel tank that connects the fuel pump to the pipes on the sending unit.

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Tuesday, December 16th, 2008 AT 4:00 PM

BZ4090

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4 POSTS

No it has a nice cone shape and plus I have put some injector cleaner in the gas. And as for the little rubber hose in the gas tank that's one of the things that I have replace. I took the gas tank off because I wasn't getting any gas and took out the fuel pump and that rubber hose was eaten away, so I replace that and now I have plenty of fuel pressure.

I might as well tell you everything that I have replace.
I replaced the fuel filter, change oil and oil filter, air filter, flushed the radiator and added 50/50 radiator fluid, spark plug wires, and the cracked throttle positioning sensor and that's pretty much everything. I'm stuck

I was also thinking that it might need new compression rings on the pistons how can, I tell if I have enough compression.

SO you don't think it is the timing chain? And thanks again you guys have been a huge help in ruling out problems.

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Wednesday, December 17th, 2008 AT 11:08 AM

BUDDYCRAIGG

MECHANIC
2,262 POSTS

About compression,
you need a compression test gauge to check it.
I bought a cheap test kit i've used for many years for about 30 bucks.
120 to 145psi is good, but really you want all of them to be within 10% of each other.
So a reading of 110, 115, 112, 103 would all be acceptable.

But the lowest compression i've seen in a running engine was about 85.
.
.
.
Timing chain.
You don't a chain, the cam gear is in direct contact with the crank gear.
You said you're rockers are moving so we'll assume the cam timing is ok.
.
.
.
A engine needs 3 things to run
compression
fuel
and spark at the correct time.

How did you verify that you have spark?