Mechanics

BUICK CENTURY TIRE PROBLEM

1990 Buick Century • 200 miles

I have a Buick century 3.3 v6. Has some hesitation problems. I've bought iac. Tps. ECM. Maf. 1 coil pack. Icm. And more. Hesitation happens all different times of day some times when cold sometimes when hot. Sometime not all day. Usually I start it up and it takes off great then the next time I stop that's when it starts. Any ideas? Also I bought the iac and they say with it plugged in and car on the pentle moves, mine doesn't not the old one or new one. Connector has 4 wires 2 have votages of like 12v other 2 have like.60v? And where should the tps be adjusted to?
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Blablablabla38
November 11, 2012.




Tps to.5 volts.

What is the fuel pressure?

Check the back pressure from the cat as well.

Roy

ASEMaster6371
Nov 11, 2012.
I think the highest it will go to is.45v
Fuel pressure I believe is great
And I've cut the pipe right before the cat and it didn't make a diffrents so I reconnected it

Do you have anything to say about the iac?
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Tiny
Blablablabla38
Nov 11, 2012.
I still need the exact pressure on the fuel pump.

.45 is good enough.

The iac will be an idle issue or hard start

Roy

ASEMaster6371
Nov 11, 2012.
I haven't checked it for a while but I used a tire gage it was around.40-.45

Tiny
Blablablabla38
Nov 11, 2012.
A tire gauge? Seriously?

ASEMaster6371
Nov 11, 2012.
Yeah I don't have $100 just to go to auto zone and rent the kit to test the pressure. The tire gauge worked to check it but it ruined the gauge

Tiny
Blablablabla38
Nov 11, 2012.
I don't think my cars down shifting unless I do it manually. I have the tcc unplugged cuz it locks up. If I plug it in

Tiny
Blablablabla38
Nov 12, 2012.
When I rev the engine in park or nutural after so high of rpm it cuts in and out real bad. And in drive the exhaust makes kind of a blunk blunk sound. The blunk goes away if I adjust the tps lower

Tiny
Blablablabla38
Nov 13, 2012.

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