'86 Bonneville Throttle Problems - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Classics (Star Chief and 1957 to 1986) Converse about your Classic Bonneville.

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Old 11-05-2007, 11:13 PM   #11
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I looked it up.... That vin is actually

2G2GN69Z

2- Mfg Canada

G - General Motors

2 - Pontiac

GN - Bonneville

69 - 4 Door Notchback sedan

Z - 4.3 FI

Alll original.. Very interesting too.. Let us know how you make out

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Old 11-07-2007, 11:32 PM   #12
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Well, the electronic spark control is fixed. it amounted to the power relay I pointed out being in need of a good cleaning. The grease that had been put in when the thing was assembled had been burned up and was sticking to the prongs. I thought the plastic had melted, but it was just dirty grease. Lacquer thinner cured that.
After we cleared that code, we tried the computer again. This time we got a code that corresponds to the computer not receiving a signal from the distributor cap.
We popped the thing open and sure enough...the points are just about non-existent. The fact that the car runs at all is some sort of a miracle, because the currents probably having to jump 3/8 of an inch to make contact.
So what it amounts to is that I need a new distributor cap and a rotor button. I'm gonna get that tomorrow and see what happens.
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Old 11-07-2007, 11:51 PM   #13
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Yeah it would sure help if the Cap and Button were good..

I'm not sure if I asked, But does that car have the 700R4 or the Turbo 350 Trans?

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Old 12-08-2007, 05:25 PM   #14
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Sorry I haven't been around in a while- I haven't really had any time to work on the car lately, but I got out to the garage today...

This one has the 350 turbo. I don't know all that much about it, but I've had two people refer to it as a P.O.*.

Throttle problem'* still not fixed. I've checked the full pump- pressure'* good and it'* not flubbing out.
I replaced the starter coil for giggles. No noticeable change.

It looks like to me that it'* not a fuel problem anyway. It looks like it gets plenty of fuel and something is inhibiting it from burning it properly in certain positions.
We tried the throttle position sensor again as a source of the problem by testing the wires running out from it to the other sensors, and the main wire running back to the computer. No problems there. We also checked some vacuum lines today, including the one that runs under the car and controls a butterfly on the exhaust system. Nothing.

I'm going to try some other ideas next weekend, but I'm still more or less in square one with this thing.
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Old 01-11-2008, 02:08 PM   #15
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I took some time away from working on the Bonnie because of work and the holidays and figured it might be best to let a garage take a shot at it since I had exhausted my resources.


Turns out the problem was trash in the fuel line.
At higher speed it was being pulled against the filter and basically blocking flow.
I was begining to think it was something simple.....

I appreciate all the advice and help offered. This one'* been a job and a half. But on the upside, it'* familiarized me with all the cars sensors and related systems. And I'm that much closer to having it in the shape I want it.


Time to pick a paint color and find some seats!
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Old 01-24-2008, 11:03 AM   #16
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Nice to see you got it fixed. RWD Bonnes are really nice and a treat to drive also. Now drop a 455 in that sucker!
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Old 01-24-2008, 08:34 PM   #17
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Sorry I was "off-list" for the early part of your dilema. Glad you got it fixed. What you got is a Rochester 220 TBI system. Probably with a type 747 ECM. One of the easiest fuel injection systems in the world to work on.

I'd suggest engine swapping to a 350/383/400 SBC, keeping the same fuel injection system if you want to hot rod it a bit. Otherwise, you can just keep running TBI on the 4.3L and learn to mess with the ECM'* code if you have a mind to.

Suggestion on rims... Jegs/Summit aluminum 15x8 rims (low buck, very low key, era correct, hot rod goodies) and some BFG Comp T/A tires. Sortta a Buick drag car with Pontiac badges
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