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99 z71 hesitates real bad right after you start it for about 1/2 mile then ok until you shut it off and start it again. doesnt matter if its cold,hot, or already been drivin

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What motor..fuel injected or not ? ..any leak under the truck...have to see if its fuel or electronics ...put a clear piece of hose in the gasline too see if you have air bubbles in the fuel......1st try starting it with the fuel cap offf ..see if that does it ..if it cranks for a bit to start you fuel could be flowing back to the tank when not running...but i would guess you gasline has a loose connection pr starting to rot

Posted on Dec 26, 2016

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Posted on Jan 02, 2017

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I had my ford tuned up the gnion swith changed and now it i s hesitation again


Then that guess was not it, there are 2999 more parts to guess.
joking.... but is true. (guessing)
why not post the symptoms and ask for help.
ok, misfire or hesitation, which is it, it cant drive it to tell.
I misfire is violent. a hesitation or really a mini bog is smooth loss of power but catches up fast.
misfire is just that , a cylinder goes dead fore 1/10 second or longer.
the if its is misfiring a scan tool connected to the OBD2 port (all answers by me are USA< unless you fess up that)
you will see code DTC error P0300 or P030x (x = cylinder that failed)
so do a tuneup, (spark parts first) then filters. do the 60,000 mile list.
at least.
if no misfire and is just hesitation?
does it do it hot and cold engine or both
if only hot then does it catch up, if yes, the TPS is bad.
if not, a bad mAF or MAP, sensor or dirty.

to get best help ,say exactly when it hesitates and under what conditions, hot or cold engine, and what is your right foot doing.
sure its moving but how far an for how long and deep .
eg
does it hesitate hills to and at wide open throttle,
and at any speed, or level of road?

Jun 30, 2014 | 2005 Ford Taurus

1 Answer

Coil pack


yes that sounds like a bad coil it will be okay when it's cold and as it heats up it will malfunction

Jun 04, 2014 | 1988 Chevrolet Cavalier Z24

1 Answer

1990 jeep wrangler runs rih won't stay running replaced map sensor and temp sensor


which engine,? the have up to 3 choices.
rih?
what are the full symptoms,
did you do the full listed 60k mile tune up on car?
sparkplugs,wire, cap rotor/filters? no engine runs right with bad spark
unless it's a diesel.
starts good
runs good or bad hot or cold engine
idle at 800 RPM hot?
stalls> when hot and cold engine
lost of power
bogging
misfire,
learchs>

only stalls , but runs perfect even up hills, at wide open throttle.
fresh gas, or 1 year old?fuel.
can your fast right foot , save the stall, and easily?

ok stalls 101.
1; lost 12vdc to EFI system.
2: lost engine compression.
3: lost spark.
4: lost fueling or floods
there is a simple test for each.
do you want more guesses, or how to do tests.
can do both, but my guessing fails 99 /100 times.

tune it up
do the right foot test. those are always first. on stalls.
always.







Feb 05, 2014 | Jeep Wrangler Cars & Trucks

1 Answer

Engine cold can not start


runs hot,ok, restarts hot ok
just dont start , cold, but it must because how do you get to 2hours?
from hot?
my guess, is it sometimes does start cold.
ever tune it up at the critical 60k mile service, ever, this decade?
that covers 99% bad cold starts. so , we do that first.
diagnosis is like 10x a tune up, so........ $$$$$

Feb 02, 2014 | 1994 Toyota Corolla

1 Answer

1988 olds shuts off when warm


Check the coolant sensor it will cut off if is bad

Sep 19, 2012 | Oldsmobile Cutlass Supreme Cars & Trucks

1 Answer

When driving my 99 dakota 4 x 4 magnum v6 the engine will shut off. If I put engine in neutral and start the truck it runs finethe


They are right in a way. It will be next to impossible to fix it if you can't duplicate the problem, because you will never know if you found the problem.
Two common problems with Mopar products are the ASD relay and the pickup coil in the distributor.

Jul 27, 2012 | 1999 Dodge Dakota

2 Answers

My 1999 Cherokee Limited, 4.0 liter automatic stumbles and/or hesitates at tip in after you first start it when warm. It acts like an engine with a carb that has a bad or improperly adjusted accelerator...


Could you explain this a little better , hesitates at tip in after you first start it when warm > hesitates at tip in ???? plus after first you first start it when warm . What's warm ? the engine ? The temperature out side ? Or after you had it running an shut it off an restart the vehicle ? The engine temp. is warm , hot etc.... cooling fans working , vapor lock ?

Mar 07, 2017 | 1999 Jeep Cherokee

1 Answer

On my f150 5.0 it starts good cold but after i drive for awhile maybe 5 miles i shut it off and start it again it is ok.But if i wait 15 min it wont start.you can try but after it cools off it will start...


It could be a spark plug problem..I would remove a few of them to see what they look like. It may not be firing very well when it gets hot, and new spark plugs are never a real bad investment, since they're generally very cheap. Not sure on this, but it's a good place to check.

Jun 26, 2009 | 1996 Ford F150 Regular Cab

1 Answer

2001 Jetta 1.8T, 100K miles. Smokes when hot.


Ouch! you've got engine coolant in the exhaust from a leak somewhere...DO NOT run this engine until you get someone (dealer is best in this instance) to diagnose ($50-125)

Jun 14, 2009 | 2002 Volkswagen Jetta TDI

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