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Old December 23rd, 2013, 02:46 PM   #1
robn69
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1990 tbi 350 hard starting! Help!

I have a 1990 ex cab chevy that starts up fine when it warm out. But when it starts getting cold you have to crank and crank on it for a while to get it to start. It will fire right up if you prime the throttle body with a little gas. And it also has fine throttle response and no hesitation when it's in high idle. But when it kicks down in to low idle it has a hesitation when you first push on gas. It will also stall sometimes if you in the gas hard and let out of it fast. Any one had a problem like this before? Any help would be appreciated!


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Old December 23rd, 2013, 02:55 PM   #2
montecarlo33
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Check your tps sensor, directions are online.
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Old December 23rd, 2013, 03:28 PM   #3
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Ok will do thanks


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Old December 23rd, 2013, 03:39 PM   #4
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Ok will do thanks


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My truck would do some of the same things, it would run like dogshit and sputter below 2000 rpms, but normal above 2000 rpms. If you put your foot on brake and gave it some gas while sitting there in gear(simulate a load) it would die, also shifted hard and funny and idled high. Also check the wires, I bought the truck the guy said he put a new tps in, but the dipshit used a butt connector on one of the wires, anyways that's what was my problem was. That's where I would start your search. Should have 5v at the sensor.
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Old December 23rd, 2013, 09:56 PM   #5
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Ok thanks! I will look in to it and maybe that will be my problem.


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Old January 17th, 2014, 08:17 PM   #6
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Originally Posted by robn69 View Post
I have a 1990 ex cab chevy that starts up fine when it warm out. But when it starts getting cold you have to crank and crank on it for a while to get it to start. It will fire right up if you prime the throttle body with a little gas. And it also has fine throttle response and no hesitation when it's in high idle. But when it kicks down in to low idle it has a hesitation when you first push on gas. It will also stall sometimes if you in the gas hard and let out of it fast. Any one had a problem like this before? Any help would be appreciated!


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It will continue to get worse until you get to a point where when you let up on the pedal at all it you will have next to no power.
This is your egr sensor and I have replaced it 3 times now on different trucks due to the previous owners giving up.
It is a expensive part at around $150 compared to the other $20 electronics. The line leading to the sensor fills up with oil and eventually ruins the quarter sized piece of foam the sensor quickly follows.

It could be one of the cheaper ones such as the tps or the wires going to the sensors. But once you check your lines for cracks, replace all these which is a good maintenance practice anyway, and are still not getting any new codes, consider replacing the EGR sensor. For some reason I never have received a code for a egr sensor(also known as a vacuum switch). But, I know the symptoms and replacing the egr sensor has fixed them easily enough.
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Old January 17th, 2014, 09:19 PM   #7
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Ok cool thanks!

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Old January 22nd, 2014, 10:13 AM   #8
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Just wondering if you still needed any help on this. Im surprised no one told you to replace the fuel filter. I work at a shop that works on mostly chevy trucks and you would not believe how many times we just change the fuel filter and it fixes most the problems. But just for future reference on that truck you do not need these parts to make it run...EGR or EGR vacuum solenoid, the oxygen sensor, ESC, or EAC. In theory these parts can be removed without any issues except maybe throwing a check engine light. Hope this helps.

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Old January 22nd, 2014, 12:28 PM   #9
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Ok thanks! Will look in to it?

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