Question about 1988 Ford F 150

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Idle low I got a 88 f150 and i replaced the egr valve cleaned the aic valve put a new fuel filter and it will idle real low then stall when driveing and slow down.

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Low fuel pressure or clogged catalytic converter. Temporarily remove one of the O2 sensors and take it for a test drive. If the engine accelerates better then the exhaust is plugged (removing the sensor leaves a hole for the exhaust to escape) . Have the fuel pressure tested if it's not a plugged cat.. It could be a weak fuel pump.

Posted on Jul 21, 2009

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88 f150 351w forever to start and when it does it runs real rough until I hold gas down for a minute then idle rough but will start right back up unless it sits awhile doesnt want to start back up


There are several possibilities for this problem. A "cold start" sequence is suppose to activate based on water temperature and the signal from the water temperature sensor. This makes the fuel rich and adjusts timing to make the engine run better when cold. It works like a choke only it is electronic.

There may be 2 sensors with one making the dash gauges work and the other doing the engine controls. If not 2, then 1 sensor would do the whole job.

Another possibility is an air leak in the fuel system which makes the system bleed dry overnight. It is far less common on gas engines but happens a lot on diesels.

Some earlier Ford engines from 1984 to I don't know when they stopped on trucks, would use a step-up solenoid on the accelerator bracket that worked off water temperature. Sometimes a bad water thermostat would make the temperature controls malfunction the other way (High idle, clicking, low idle) that would stall and engine as the temperature vary.

Feb 27, 2015 | 1988 Ford F 150

1 Answer

Engine vibrates in idle real bad


sound like idle speed low idle you need to remove throttle body clean entire throttle body spray cleaner down throttle body bore if cleaning throttle body dont help the dealership has to check it out.a faulty egr valve could be stuck partially open that will cause rough idle and stalling. replace air filter clean fuel injectors.your fuel system could be too lean caused by clogged fuel injectors or weak fuel pump check fuel pressure and also check all intake vacuum hoses make sure pcv valve working should have suction and make sure its in place and the pcv valve hose not cracked open or damaged.

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My 04 f150 had a rough idle and would sometimes stall out. dealer said it was throttle body so I replaced. The idle is still rough but it it doesn't stall. Could it be a coil pack? if so do I need to...


I have a 2005 f150,with a 4.6 and it idles rough and when you turn on the ac it wants to die. Checked the codes and there are no codes.Any suggestions?

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3 Answers

Will a faulty E.G.R.valve on a 1988 Olds.Cut.Sup.FWD cause a hot engine to stall when stopping at corners?


well it will casue it to stall if the egr is stuck open and you stop at a light or stop sign,due to it beinge stuck open the open egr valve acts like a vacum leak,,,,ive also seen bad fuel pumps and fule filter to cause a stall while hot and cornering

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1 Answer

@002 Protge 5. Very low idle and kinda dies out when driving. Put new plugs in it and still the same? Sometimes stalls at stop lights?


REmove the idle control valve, clean and replace. Check plug wires, check fuel filter and fuel injectors.

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F150 stalls out at intersections.


Check there are no air leaks on the air intake system. - check all the clamps/hoses etc that may have been removed to replace airflow sensor.

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1 Answer

1992 chevy corsica runs rough,stall or dies after stopping


Sounds the EGR valve and EVP sen is bad even if you tested it. The EGR valve cntrols idle and if carbon up will make the car stall or idle high and low (rpms going up and down) This was common on all cars during that time. I would say replace the EGR valve and senosr. This should take care of the problem. One more thing have the fuel pressure check on the car.

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