98 chevy blaser is hard to start when is cold the fuel presure is fine

One possible reason for this could be a faulty engine coolant temperature (ECT) sensor. The ECT sensor tells the engine control module (ECM) the temperature of the engine coolant, which is used to adjust the air/fuel mixture for starting. If the ECT sensor is faulty, it may be sending incorrect temperature readings to the ECM, causing the engine to not start in cold weather.

Another possibility could be a weak fuel pump check valve. When the fuel pump check valve fails, it can cause the fuel pressure to drop when the engine is turned off, which can cause hard starting in cold weather .

It's also possible that the battery is weak and not providing enough power to start the engine in cold weather. Cold temperatures can reduce the battery's cranking power, which can make it difficult to start the engine.

I would recommend taking your vehicle to a certified mechanic to diagnose the issue.

hi.fault codes indicate feul presure or leaks.if feul presure is ok and no vacuum leaks at vacuum pipes intake manifold or brakebooster it can be a exhaust leak if no leaks it can be a blocked cat or not enough back presure like exhaust box removed or cat insides removed .hope this helps

check for a bad fuel pump relay. One of the first signs of a failing DME/Fuel Pump is difficult hot starting. Quite often when the DME/Fuel Pump relay starts failing the car will start without problems when it is cold. However, when the car has been operated at normal operating temperature for a while, it will refuse to start. Its worth a try! (usually 30 minutes to 1 hour), the car will again start without problem. Is this the case! Good-Day!

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 .

pluged air intake

try opening the air box then start and drive if all works fine snake the intake tube with garden hose
if it does same thing look for vac leaks then fuel presure
theres a schrader valve on the fuel rail for testing fuel presure and weather the rail holds presure when not running

can be a number of things from fuel pump to coil pack but check the egr valve may be starting to go -remove and check for carbon build up if not fully encrusted use a carb/or a carbon cleaning solution to clean and free up valve--most problems give a code but -fuel pump-filter-air filter dont and egr will sometimes set off other sensors but usually doesnt until its to late

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Try replacing the fuel filter also Has it had a tune up? they need to have the plugs replaced at 100,000 if the fuel filter does not work then the most probable cause is the fuel pump is losing pressure when hot. The pump warms up and the check valve fails to close all the way allowing a now fuel or fuel starvation.

SOUNDS LIKE YOUR FUEL PRESURE NORMALLY A FAULTY PUMP OR PRESURE REGULATOR

Check fuel presure.I believe its 61 to 65 psi, with little or no drop off in ten minutes.V-6 access port for fuel presure is at left rear of engine,(remove dog house to access). Fuel pump is in fuel tank.Use AC Delco only, there is a updated wire harness conector for these.