UK Car

UK car repair questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

Car wont start - no spark. replaced crank sensor, cam

Customer Question
Car wont start -...

Car wont start - no spark. replaced crank sensor, cam sensor, maf, intake temp, sparks, coil pack. when i plug my laptop in (scanxl pro software) ALL of the sensor values are going crazy, for example, rpm goes from 34,000 to 2000, when the car is off! bad ground, +ve wire touching another wire???

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix with a Mazda. The Mazda Mechanic I'm going to connect you with knows all the tricks and shortcuts. Are you hoping to fix this yourself?

Yea

Mechanic's Assistant: Great! What have you tried so far?

Car wont start - no spark. replaced crank sensor, cam sensor, maf, intake temp, sparks, coil pack. when i plug my laptop in (scanxl pro software) ALL of the sensor values are going crazy, for example, rpm goes from 34,000 to 2000, when the car is off! bad ground, +ve wire touching another wire???

Submitted: 2 years ago.Category: UK Car
Show More
Show Less
Ask Your Own UK Car Question
Answered in 17 hours by:
3/1/2016
UK Auto Mechanic: Peter Zavarelli,
 replied 2 years ago
Peter Zavarelli
Category: UK Car
Satisfied Customers: 33,940
Experience: Technical Consultant at Just Answer
Verified

My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.My info is somewhat limited on your model here but I had seen no one else has responded and would like to see if I can help here.If at any time you feel that I cannot help with this please let me know.

Inspect the wiring running to the engine computer to see if any issues are found with the wiring.If no wiring is found at fault one common component I have seen cause this issue here especially with the erratic readings from the sensors is a fault with the computer itself needing replaced.I have had to replace this computer several times before in the past to correct this fault here.

If more help is needed, use the reply tab to continue our conversation. If no further assistance is needed, kindly rate my service.You can rate at any time and we can continue to work on your question as this will not close out your question.Keep in mind in some cases it can be difficult to fully diagnose or help repair your vehicle without seeing it and I work on delivering the best possible answer from what I see to work with.

Thanks Pete

Ask Your Own UK Car Question
Customer reply replied 2 years ago
Hi Pete, thanks for replying. I've got the car running now, sensor readings are still all over the place, BUT, the problem lies with the crank position sensor - give it a tap and the car stumbles, pull on the wire and the car stumbles. So I will replace the crank sensor and go from there. The ecu sensor readings may be a red herring - the car drives well WHEN IT RUNS, fans kick in etc, good acceleration, she's pretty quick. Perhaps my scan tool and software are partly/all to blame for the dodgy graphs.Thanks,Tom
UK Auto Mechanic: Peter Zavarelli,
 replied 2 years ago

The scan tool may be causing this here with the readings or a short in the sensor causing erratic readings.

Make sure the connection and terminals are a tight fit in the connector to the crank sensor and make sure the wiring isnt shorted together at all causing this here.If this is all checked and found to be o.k. then the sensor needs replaced.

Let me know if you need anything else and feel free to rate my help here.

Thanks Pete

Ask Your Own UK Car Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with an uk auto mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Peter Zavarelli Your Own Question
Peter Zavarelli
Peter Zavarelli
Peter Zavarelli
Category: UK Car
Satisfied Customers: 33,940
33,940 Satisfied Customers
Experience: Technical Consultant at Just Answer

Peter Zavarelli is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Marty

Marty

European Car Expert

432 satisfied customers

ASE & Bosch Certified Master Tech. Over 30 years experience.

Greg

Greg

Shop Owner

1,367 satisfied customers

17 years Shop Owner /Technician. 27 years experience,

Richard

Richard

UK Car Mechanic

627 satisfied customers

12 years as a technician at a Ford and Jaguar dealer Ford and Jaguar factory certified

Matt

Matt

Mechanical Engineer

4,709 satisfied customers

BEng hons Mech engineering, in auto industry 22 years

Trevor

Trevor

UK Car Mechanic

853 satisfied customers

NVQ 3, Modern Apprenticeship, MOT Tester, 15+ years experience diagnostic technician

Rob

Rob

UK Car Mechanic

823 satisfied customers

city and guilds level 1 2and 3. mot tester , 28 years experience set up training college in afghanistan

martin jones

martin jones

UK Car Mechanic

646 satisfied customers

25 years as a mechanic and mot tester, owned own business for 10 years city and guilds trained

< Previous | Next >

Related UK Car Questions
I have a Toyota Agyo 2012 1krfe engine (RHD) just died and
Hi I have a Toyota Agyo 2012 1krfe engine (RHD) just died and since a month it just swings fast but no spark. The fuel is perfect pump works just over floods Things we did Replaced battery Replaced cr… read more
Greg
Greg
Shop Owner
Vocational, Technical or Trade Scho
1,367 satisfied customers
I have a 2003 Land Rover freelander which doesn't start
I have a 2003 Land Rover freelander which doesn't start after replacing the headgasket.i have tried timing it many times. It has spark but the injectors only fire for a second on first start up the en… read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
103 satisfied customers
Got an open question with another technician but want to
Hi there, got an open question with another technician but want to swap to you. Its the same PT but new issue. New issue is will not start. Cranks OK. spark at 2 and 3 plugs - none at 1 and 4. Replace… read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
Ford Escape, V6: Ron! Ford escape v6, 2002. 3 codes come
Hi Ron! Ford escape v6, 2002. 3 codes come on my obd scanner Po43F, Po7E5 and finallyPo100. Engine sounds like 1 cylinder doesn´t allways come in. If cranked up things get normal. What´s wrong? All th… read more
Billy
Billy
Bachelor's degree
38 satisfied customers
Volkswagen Golf: VW Golf 1400AXPI have a Golf in at the moment
VW Golf 1400AXP I have a Golf in at the moment with an intermittent Fault 16492/P0108. I have replaced all sensors in the car bar the temp sensor, the map sensor has been changed twice. The ECU has be… read more
gomi_otaku
gomi_otaku
Auto Technician (dealership)
Vocational, Technical or Trade Scho
2,229 satisfied customers
clio 1.6 8v: Hi I have a 1998 Clio 1.6 rxe. I have changed
Hi I have a 1998 Clio 1.6 rxe. I have changed the engine due to snapped cam belt. Ever since the change I have had a missfire it happens when the engine has been allowed the cool for more than 5 mins … read more
Mark
Mark
348 satisfied customers
i have a 2002 vrs skoda octivia when is its started from cold
i have a 2002 vrs skoda octivia when is its started from cold or hot it revs all the way round to 7000rpm on its own unless u hold your foot on the break then it will idle as soon as you release the b… read more
Matt
Matt
Mechanical Engineer
Bachelor's Degree
4,709 satisfied customers
replaced the ht coils and leads on my mg zs 120 and the engine turns
I have just replaced the ht coils and leads on my mg zs 120 and the engine turns over but will not start… read more
Mike
Mike
Proprieter / Diagnostic Technician
High School or GED
95 landrover discovery wont start it cranks..wont run..charger
95 landrover discovery wont start it cranks over fine but wont run but if i put a charger on it it will run then after its running i shut it off then try to start again it wont unless i hook up a char… read more
gemmechanic
gemmechanic
Diesel Teacher
Vocational, Technical or Trade Scho
130 satisfied customers
95 subaru legacy: dies after 10 minutes..engine coil pack..cools down
95 subaru legacy dies after 10 minutes - spark lost in engine coil pack - pack replaced also amplifier and moniters in various places .Starts first time when engine cools down and runs perfectly for 1… read more
#1 Diagnosis
#1 Diagnosis
Repair shop owner/Technician
Vocational, Technical or Trade Scho
8 satisfied customers
Valve cover gaskets..started fine..the check engine light came on
1997 discovery. Just replaced valve cover gaskets yesterday, then started fine. Driving to work this morning the check engine light came on. Stopped at office, then drove to satellite office 30 min aw… read more
DBranch
DBranch
Technician
Associate Degree
14 satisfied customers
Ml320: year 2000..starts ok..1500 changed spark plugs , maf..coil pack
Hi ml320 year 2000 starts ok then revs drop missfires will not rev above 1500 changed spark plugs , maf , and coil pack no change… read more
jon-t
jon-t
Vocational, Technical or Trade Scho
895 satisfied customers
p300: fault code..Local mechanic diagnosed..spark plugs..coil packs
Mitsubishi Spacewagon engine just died.RAC tech read fault code P0300 but could not help further. Local mechanic diagnosed failed spark plugs changed the set but still would not start. Now recommends … read more
wefwef
wefwef
Vocational, Technical or Trade Scho
305 satisfied customers
Vw: reg..heavy rain..it for a few days and it still wont start
i have a p reg 1.6 vw polo and during the heavy rain the other hignt it just stopped and would not start i have left it for a few days and it still wont start . any ideas on what this could be… read more
Matt
Matt
Mechanical Engineer
Bachelor's Degree
4,709 satisfied customers
I have a Peugeot 206CC and the engine management light is on
I have a Peugeot 206CC and the engine management light is on and an 'AntiPolution Fault' displayed. I cannot find any details in my handbook to point me in the right direction therefore can you please… read more
AAboy
AAboy
Master Technician
Vocational, Technical or Trade Scho
194 satisfied customers
1997 P Corsa 1.4L starts and runs fine..accelerate..smoothly..misfires
1997 P Corsa 1.4L starts and runs fine when cold. When hot idles OK but will not accelerate smoothly and has lack of power/misfires. What are the likely causes?… read more
Davie
Davie
Vocational, Technical or Trade Scho
202 satisfied customers
97 fiesta: swapped out Coil & Leads maf, tps, Cam & Crank sensors
97 fiesta zetec stops revving at around 4K, have swapped out Coil & Leads MAF, TPS, Cam & Crank sensors. Any other idea of what to do.… read more
John
John
Vauxhall Technician
Vocational, Technical or Trade Scho
130 satisfied customers
1995 JAGUAR XJ6: 000 MILES..CHANGED PLUGS..A LITTLE HESITATION AT IDLE
I HAVE A 1995 JAGUAR XJ6, GOT THE ENGINE FROM JUNK YARD W/60,000 MILES CHANGED PLUGS AND ENGINE SEEMS TO HAVE A LITTLE HESITATION AT IDLE AND WHEN LITTLE GAS APPLIED.PLEASE HELP… read more
RIP
RIP
Lead Technician/ JA Car Category Mentor
High School or GED
452 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x