Question about 1989 Chevrolet C1500

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My 1989 silverado surges really bad in mornings when cold

Run ok when warm but never reallly gets over 150 degreees. I have replaced the coolant sensor tps sensor oxygen sensor and map sensor it still does the exact same thing. I have to start the truck up let it warm up then unplug the coolant sensor to be able to drive it. Im lost. Has new fuel pump and new throttlebody and my fuel pressure looks great. please help me

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HI, You need your coolant temperture to run 195 degrees, start by replacing thermostat with correct part and re-check..

Posted on Dec 01, 2008

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I have a 1991 pontiac trans sport with a cold start engine surge. At cold start up the engine will increase and decrease in the rpm and sometime die but ofter the van worms up it seems to run ok.


remove and clean IAC ( idle air control ), this is what controls idling on to days cars. if this does not help a lot, check or replace coolant tempurature sensor. it may be bad, if it is, it will think the engine is always warm and send wrong info to pcm. good-day ! and may god bless. you can also have a vaccumn leak ! if check engine light is on, get it scanned to know what area is causing the problem.

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1989 mpv mazda does not start on cold mornings and days


I'm assuming the engine cranks with the starter but does not start and run.

check the operation of the cold start injector. This is a separate fuel injector that injects fuel into the intake manifold to help richen up the mixture for cold starts. It operates on a timer that is linked to a sensor that measures engine coolant temperature. Once warm or the timer runs out, the cold start injector is turned off. Other things to check:

Fuel pressure too high (floods engine through cold start injector), engine coolant temp sensor or intake air temp sensor is stuck at full hot (doesn't allow enough fuel for cold starts), fuel injectors are leaking (floods engine with fuel).

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I have a problem with my 1999 chevy silverado4.8 liter v8 it shutters and surges when its cold once it warms up it runs fine i already put on a fuel filter cut off the cats and put a new massflow sensor on...


pull the pluga and check the color of the electrode, if any are a light color you are getting coolant into the combustion chamber, then its either a head or intake gasket,

Nov 11, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

2000 Pontiac Sunfire, 2.2 litre engine, automatic. Suspected bad heater in O2 sensor. Idles really rough when first started up in the morning. Exhaust smells really gassy. After engine warms up runs great...


i wouldn't be looking at the o2 sensors! look at the coolant temp sensor! when the car is cold it doesn't correct fuel & air ratio until it is warm so it is not looking at the o2's till then! if the sensor is bad and telling the computer it is warm when it is cold them it would be leaned out and run like that then when the car gets warm it's fine because the sensor is still saying it's warm! would be the opisite if it went bad and was telling the computer it was cold! that is a sure sign of the temp sensor being bad! good luck

Sep 18, 2009 | 2000 Pontiac Sunfire

1 Answer

1989 ford f150 loss of power


1989 is fuel injected, on the intake there is idle air control valve, make sure this is not dirty, also you may want to check the coolant temperature sensor, if the engine thinks it is warmer then waht it is the fuel air ratio will be off and your truck will run bad.

Jul 15, 2009 | 2000 Ford Focus

1 Answer

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Bad Water pump! replace your thermostat, radiator cap and flush the cooling system while ur at it.

Feb 01, 2009 | 1989 Ford F 150

1 Answer

A few Problems: Starting, Heater & Radio


Problem 1: buy a system heater to keep the engine warm at night.
You can buy them at any autoparts store . You take your pick from the variety.
Place a light 100 Watt Bulb near the battery but not too close to anything else where it might burn anything.

Problem 2. Check your coolant level to see if you have the proper level. Make sure you have 1/2 antifreeze and 1/2 water if you add any coolant /antifreeze and bleed the colant system. By running the car let it cool, then turn the radiator cap or turn the bleed screw provided on some cars near the thermostat outlet. Then adding some more water and coolant etc.The tightening the cap or bleed screw. When radiator is full. Check the radiator and and remove any debris that may be keeping the air out.

Problem 3. Will get fixed because your battery won't die.

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2 Answers

2000 silverado 4.8 v8 runs bad when it is cold out side.


Try replacing the coolant temperature sensor for the injection system.

Jan 05, 2009 | 2000 Chevrolet Silverado

1 Answer

1999 Chevy silverado


hi a bad water pump will not let the engine run normal unless it is frozen up. it sounds like your coolant temp sensor has gon bad.that will cause rough cold starts and work fine after warmed up

Jan 04, 2009 | 1999 Chevrolet Silverado 2500

1 Answer

97 f 150 runs hot for minutes then runs ok


It could be a faulty thermostat. Did it do the same thing before u replaced the t-stat? It sounds like it's sticking closed, then all of a sudden it opens, coolant flows correctly. I'd consider changing it again. Check to make sure parts store is giving u the correct temperature thermostat also. Maybe it's too high for your Ford, delaying the opening.

Nov 25, 2008 | 1997 Ford F150 Regular Cab

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