Question about 1996 Buick Regal Olympic Gold

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Turns over, not firing. almost like lack of constant fuel. once it does start, runs like a champ. fuel pump, iac, throttle body dirty????

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Most likely the cold start valve is the problem. If there is a fuel pump problem or dirty throttle body, it would not run like pa champ once it started.
There are 2 possible causes of this problem:
1- Coolant temperature sensor gives erratic resistance readings confusing the ECM. The cold start valve only activates when ECM gets signal from coolant temperature sensor at cranking. 2- If there is a signal to activate, but it didn't open since the cold start valve is bad. Check these out and replace them to address the problem. Good luck.

Posted on Nov 15, 2009

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Posted on Jan 02, 2017

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it will be a good idea to clean injector. It's a good thinking to clean throttle body......never forget for good combustion you need AIR,good FUEL,and good spark
when you need to crack up the throttle plate to start means throttle body dirty and IAC valve dirty or not working properly
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Dirty throttle body . Does it run good when you step on the gas pedal ? driving down the road . Don't guess , do fuel pressure testing . Videos on youtube showing how , fuel pressure tester under $30 most part stores .

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Might be a dirty IAC idle air control valve. When starting up and it is struggling to idle does the car have a tendency to cut out if for example you turn the front wheels or put a foot on the brakes. If so, this looks like an IAC problem. Generally the fix is very easy and just requires the IAC to unbolted from the throttle body and cleaned with carburettor choke cleaning spray and then wiped down with a cloth. Once cleaned like new check the IAC ports on the throttle body itself and clean these. Make sure that everything dries off, reassemble and that should be it

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If there is no filter there, then the filter is a non serviceable filter and is integrated with the fuel sending unit. Your going to have to replace the fuel sending unit if the fuel pressure is slow, start with running fuel injector cleaner through the fuel system for the next few fill up's and hope that will clear up the issues your having.

The other thing to is that your IAC (idle air control) valve may be dirty and is stuck close, you can try cleaning it by spraying Throttle body cleaner through the throttle body, paying attention to the IAC passageway. A dirty of faulty EGR valve will also do the same thing.

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Try replacing the fuel filter and check the fuel pressure at the shredder valve. Low fuel pressure from a week fuel pump or dirty fuel filter will cause hard starts, a bad ground will also do the same thing so check the ground wire for the fuel pump which is separate from the main wire harness to the fuel pump sending unit.

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