I have a 1987 Ford Ranger and sometimes when you start it up (hot or
cold) the engine runs so ruff that it feels like only three of the six
plugs are firing. The engine shakes so hard that it feels like it's
going to jump right out of the truck. Then after a while it starts to
run OK. Sometimes when you come to a stop sign, the engine dies. It
usually starts right away and runs OK, but sometimes it doesn't. It
has a manual trans, V6, 2.9L engine with twin gas tanks. The engine is
fuel injected with electrical ignition. I keep the engine tuned and
with regular oil changes. I just replaced the air filter, spark plug
wires and distributor cap about 8 months ago. Twice I've added
'Heet' products to the gas tanks to get rid of any possible water
in the gas. Also, added a product to try and clean out the fuel
injectors. The other day it started and would not take the gas at all
and the engine died each time. The battery finally died and had to put
it on a battery charger. The next day it started like nothing was
wrong. The truck never acts up when you are driving down the road at a
constant speed or slowing down. Can you please help?
Thanks! Rocky R.
To Krusty OLD Geezer,
Yes, I always change the plugs when doing an engine tune-up. I even
took the truck to the Ford dealer and they kept it for two days testing
and trying to find out what was wrong. No luck, it just wouldn't act
up when they had it for those days. I guess what I need is to find
someone who has a Ranger or maybe any other vehicle that did the same
and can let me know what they did to fix it. Thanks for your time
anyway and I am trying to DEAL with it.
I am too lazy to look up and see if that is CFI (throttle body
injection), which is it?
First thing I would do is get the ECM(PCM) codes read out. Get the codes
not the description.
Then, if no codes, think about any other oddities, like how it idles when
started and at stop signs, lights, etc.
After making sure that the ISC/IAC/IABP _ different terms for same idle
control valve -or motor- is working right.. clean or replace it. Move on
to other culprits.
IOW - if engine racing, at any random times, may point to bad wiring
Another good place to start is the TPS (Throttle position sensor)...
flaky return from this might cause PCM to think you are pumping the accel
and will deliver more gas than needed through injectors. It is
relatively inexpensive and easy to replace.. use Echlin, stay away from
Next is connections to ECT sensor.. then Fuel pressure regulator on the
Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!
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