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Put in new timing chain fuel pump,car run but it back fire sound time,it crank right back up,i chance the mass air flow sensor.it run the shut off again

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Please clarify you situation and I will try and help.

Posted on Aug 09, 2008

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91 chevy cav z24 5 spd will not start @ times sounds like no fire other times sounds like no fuel.Replaced fuel pump,timing chain, crankshaft sensor,oil sensor,map sensor,body throttle accel sensor.st


Pull the air cleaner off and crank the engine. If puffs of air come come out of the throttle body when cranking the engine then the timing is not set correctly. Otherwise, after cranking pull a spark plug and see if it is wet with fuel and if so this indicates an ignition problem (coil, distributor/cap/rotor or faulty ECU).

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1994 Ford Ranger 4.0 cranks runs about 1 to 1 1/2 minute and cuts off.


There are 2 relays in the relay box that could cause this problem the EEC relay and the FUEL pump relay the best test for EEC relay back probe the throttle position sensor for the 5 volts reference signal run engine and watch to see if you lose this voltage. and fuel pump relay install a fuel pressure gauge to fuel rail service port and check to see if pressure drops to zero.

Mar 22, 2014 | Cars & Trucks

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How difficult is it to replace the timing belt on a 1998 chevy 1500 4.3 liter engine? my pickup just quit on me one morning, thought it might be out of fuel, put plenty in, sounds like the pump is...


It would be the most difficult thing in the world to replace a timing belt on a 4.3L Vortec engine...It is a CHAIN driven engine. It is not real likely that there is a problem with the timing chain...unless the engine does not know what an oil change is...Not real common on that engine. What is common is failed fuel pumps at around 110,000 miles. If the fuel pump has not been changed already, that is your most likely culprit. "Hearing" the fuel pump is not good enough. You must check FUEL PRESSURE at the connector on the fuel rail. - OR you could use a small amount of starting fluid to see if the engine comes to life for a second - a good indication that it is not getting any fuel. A good place to spray some starting fluid is through the hole in the intake snorkel where the PCV breather tube goes in. (The plastic tube that runs down to the valve cover) Just pull the breather tube out of the snorkel, spray some starting fluid in and crank it up. If the engine goes VR-R-O-O-O-O-O-M! replace the fuel pump. Don't use too much, or your snorkel and air cleaner box can explode...If you can get someone to help you it would be even better...Have someone start cranking the engine just before you spray some fluid in the hole - that way, all the fluid will move directly into the combustion chambers without getting a chance to go the wrong way and flood the air cleaner box. Trust me...The elements in the Mass Airflow Sensor can get hot enough to ignite the starting fluid, so this can be a not-so-safe method of diagnosis. I know mechanics that do this all the time without any problems. I also have seen an air cleaner housing explode in a man's face...not pretty.

A timing chain that has "jumped time" can easily be diagnosed with a scanner that can read engine data. All you have to do is look at the CAM/CRANK SYNC data...it will say either "YES" or "NO" if it says YES when you crank the engine, the problem is not related to the timing chain.
The only sensors that are likely to make it just up and die on you would be the Crankshaft Position Sensor or the Mass Airflow Sensor. If it has spark, it is definitely NOT the Crankshaft Position Sensor. If it is the Mass Airflow Sensor causing the problem, it should start and run if you unplug the sensor. It will idle rough and won't have any power, but it WILL run without it.

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Changed fuel pump, fuel filter, air flow sensor,iac motor, fuel regulator, engine still idles up and down, cranks a long time before starting and once running has no power and run rough. also put in...


When it is running go the tailpipe and with a glove on, check to see how much exhaust is coming out. It sounds like a possible plugged catalytic converter

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My 2001 chrysler concorde 2.7L started running really rough and now I cant start it. It tries to start but sounds as if the timming chain has jumped a notch, and how do I check the trouble codes. could it...


Is it poping back threw the intake or exhaust? if so it could of jumped time, the massair flow sensor will cause it to run really bad as well. You need to test fuel pressure and replace fuel fliter then try it again if fuel pump pressuer does not pump to 40 PSI and hold for 40 seconds then the check valve in the pump is bad ad you will have to replace the fuel pump and sock. let me know about the back firing first.

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Engine looses power going up hill, no check engine light at this time.


How old is the Catalytic Converter, sometimes they will get clogged up and affect performance.
Good luck

Aug 26, 2008 | 1997 Chevrolet C1500

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FIRING ORDER & CAR QUITS WHEN YOU PLUG IN MASSIVE AIR FLOW SENSOR


Hello,

You really need to start with basic troubleshooting. Is there spark to the spark plugs? Do you hear the fuel pump prime during initial Key On & during Engine Cranking?

Why did you change the MAF (mass airflow sensor)?

Jun 29, 2008 | 1993 Buick Century

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