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Old 05-09-2006, 05:45 PM   #1
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Default Attention GM gurus! I FIXED IT!!!

1995 Pontiac Sunfire GT. Starts, idles really really crappy. Computer said MAP Sensor voltage high. Replaced MAP sensor. Same story. Seems as though it is out of time. Replaced a bad waterpump that was shot beyond belief. Possible belief that when the pump was removed it took some tension out of the timing chain/belt thing (The pump would barely turn by hand and had been driven that way for weeks.) which caused it to jump timing... Ticking/grinding reported prior to water pump failure on start up. Not present now. Any thoughts or suggestions?


P.*. It ran fine prior to the water pump replacement.
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Old 05-09-2006, 05:48 PM   #2
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Most likely the tensioner went bad or the chain is stretched.
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Old 05-09-2006, 06:15 PM   #3
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Anudder note. It'* a 2.3L DOHC....
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Old 05-09-2006, 06:21 PM   #4
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1) Of all the failures I have yet to see a Quad 4 ( Later Years the Twin Cam 2.4 )... Jump time...

2) When you start a Quad 4, the tensioner should do its job as oil is pumped throught the tensioner to push it out taking up the slack in the chain..

3) If it were to jump time, or when the water pump was replaced it the timming was not set right it will never run right.. Are we sure that the timming was set correctly? Did you set the timming or did someone else do it?

4) I have seen too many Quad 4( also Twin Cam 2.4'* ) Blow the head gasket as people did not want to pay to have the water pump replaced... That gets to be costly...

The Quad 4 is a good motor, I won't knock it as I have seen them go way over 200K, But even to get that far it did have the head gasket replaced along with the water pump.. I think the guys son sold it with 230k on it, and made several trips from Florida to Texas.. But when things go wrong with them it can get a bit expensive..


Blackbird you have any more info for us to look at?

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Old 05-09-2006, 06:23 PM   #5
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I missed the PS part...

Either someone forgot to hook something back up or the timming is off

Also on a quad I'd set the timming in such a manner...

Get the crank to 12 O'clock then back it off a hair so that the pistons will be about center in the bore, turn the cam gear and install set pins into the holes in the head, this goes for the intake and exahust sides, Once the pins are set, bring the crank back to 12 O'clock, install the chain making sure the play is at the tensioner side... remove the set pins and reassemble... If this was done properly there should be no timming issues

PS... The Quad 4 DOHC 2.3 and the 2.4 Twin Cam engines are the easiest DOHC engines to set the timming on I have ever seen

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Old 05-09-2006, 06:28 PM   #6
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Timing was never messed with. The drive gear for WP has a spined shaft set up. You just grease the shaft on the WP and slide it in. What I was saying is, is it possible that with that other water pump so bad off that it greated a lot of tension. Nothing was ever done to adjust the timing in any way. Went over everything twice with three people to find any sensors that may have been left unplugged. Nothing. Only other thing done at the time was new plugs and the little boot things on that crazy *** ignition module thing.


Jr. The nasty engine mount on the front of that engine has three bolts holding it to the block. How the crap do I get those out without pulling the engine or dropping the sub frame? Believe me, a hole saw has crossed my mind on this one... Any suggestions? I can get them backed out but they just hit the fender well.

P.*. Thanks for the vote of confidence on setting timing. I sorta assumed that after I read the manual. How do I get that blasted cover off though?!
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Old 05-09-2006, 06:33 PM   #7
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also take that cover off from under side of the plate make syre it id ok aswell
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Old 05-09-2006, 06:33 PM   #8
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Thats good to know...

These quad 4'* get too tricky... Good friend has one and its had issues for the last 2 years... The dealerships can't even get it figgured out... I gave up on it...

So you replaced the rubber boots? And yeah thats one freaky ignition module... The coil housing actually has metal strips running throught it to the corrosponding plug... I have seen them burn out, also seen the boots go bad as well as a coil failure or 2...

You guys have walked into a mine field on this one

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Old 05-09-2006, 06:35 PM   #9
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Quote:
Originally Posted by duffer26
also take that cover off from under side of the plate make syre it id ok aswell
As in, just loosen the plate and then take the timing cover off? BRILLIANT! I don't think I can torque it back on then, but I think I'll manage... If that'* what you're suggesting, that'* what I'm doing. I just don't want to tear it down to the cams and then find out that'* not it.
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Old 05-09-2006, 06:37 PM   #10
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had a 90 GP with the 2.3 and when it was on it was on took it to Phoenix and did 32 mpg at a average speed of 90 lol man that thing would haul for a 2.3
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