I have a Buick Century 3

Tiny
BLABLABLABLA38
  • MEMBER
  • 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?
Sunday, November 11th, 2012 AT 8:15 PM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Tps to.5 volts.

What is the fuel pressure?

Check the back pressure from the cat as well.

Roy
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Sunday, November 11th, 2012 AT 8:17 PM
Tiny
BLABLABLABLA38
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  • 30 POSTS
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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Sunday, November 11th, 2012 AT 9:07 PM
Tiny
ASEMASTER6371
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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
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Sunday, November 11th, 2012 AT 9:15 PM
Tiny
BLABLABLABLA38
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I haven't checked it for a while but I used a tire gage it was around.40-.45
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Sunday, November 11th, 2012 AT 10:44 PM
Tiny
ASEMASTER6371
  • MECHANIC
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A tire gauge? Seriously?
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Sunday, November 11th, 2012 AT 10:50 PM
Tiny
BLABLABLABLA38
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  • 30 POSTS
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
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Sunday, November 11th, 2012 AT 10:55 PM
Tiny
BLABLABLABLA38
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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
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Monday, November 12th, 2012 AT 4:07 PM
Tiny
BLABLABLABLA38
  • MEMBER
  • 30 POSTS
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
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Tuesday, November 13th, 2012 AT 2:07 AM

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