jcjmw

I still have that occassion hiccup / P0102 MAP code that is driving me crazy.

I just installed my AFR gauge. At idle in drive, my afr shows a steady 13.8-14.0. But, with the hiccup or P0102 MAP code, my afr at idle in drive jumps to 19.2 and moves between 19.2 and 20.9.

SOMEONE has to have solutoin to this hiccup / P0102 MAP problem? Anyone?

jcjmw

At WOT, AFR is at 10.9-11.2. With the hiccup, the AFR at WOT is 12.4-12.5.

I again checked all the connections, lines and so forth. There is no air or vacuum leak. I can not figure the cause of this MAP code / hiccup.

Joncl

The only fix at this time is to turn off the car and restart do not try to drive around after the hiccup as in those lean conditions it may do damage or pop it altogether. It is not a vac leak or anything like that it just seems that the ecu chooses a different map and all goes haywire

jcjmw

Thanks for the response, yes I am aware of the restart method. I was hoping a different tune might do the trick but others with the same problem also have tunes from different tuners. But, there has to be a solution or reason why some have this problem and some do not.

turbo97se

Have you changed your MAP sensor? Not sure what the history is for your car - what have you tried to change? What is your AFR at partial throttle and at WOT? If there is a big jump in AFR from 14.7 to say 9, it would also possibly cause hiccup.

ajm55

I'm still experiencing hiccup mode from time to time. It's frustrating and, if one's not very careful, can result in catastrophic failure. A new MAP sensor made no difference on mine and (as far as I can gather) nor did it help any of the others who've replaced the sensor.

My AFRs do dip from 14.7 into the 9s at part throttle. Why do you suspect this may be relevant?

jcjmw

I was just surprised how much leaner the AFR became because of this hiccup. By chance, have you changed to a different tuner to see if the problem goes away?

Joncl

I know a few guys have switched to different tuners and same thing. I think renntech would be the only savior.

ajm55

I suspect that there are many more guys out there sitting on this ticking time bomb but just don't know it because they aren't monitoring AFRs. Hiccup mode on my car is, in some instances, undetectable but for the spiking AFRs. I'm confident that (unbeknown to me at the time) this issue caused my engine failure a year ago.

Still the same tuner here - Weistec - Nothing has been done on my car as yet to try and resolve the issue via the tune. I will be sending them logs soon with a view to updating the break-in tune they sent me - hopefully the changes that are made will resolve the issue

turbo97se

If it is a sharp transition especially at part throttle, then that is your issue. Cars do not like sharp transitions. You probably go from a nice 14.7-15 (closed loop) to 9 all of sudden and back again … as the car jerks, your foot will jerk also exacerbating the issue. Time to talk to your tuner about the issue. Jump in engine timing as it switches between can also be an issue. Your AFRs should not go that low. AFR in the 11s is safe enough.

ajm55

Thanks for the input. I'll certainly make enquiries with my tuner. Hey, if this resolves my issue, I'll hook up with you and buy you a few beers - and I'm taking into account the 20 odd hours of travel time from South Africa.

Joncl

Look at some of denrolls logs here capturing the hiccup, he's given those to a few tuners and still nothing

jcjmw

I know that is why this is so frustrating.

Joncl

Have you tried contacting renntech?

jcjmw

No. Do they have the solution?

Joncl

Considering that they charge so much I highly doubt they would leave a customer like that, I also suspect they can also access certain maps since they work with AMG

jcjmw

By chance, do you have a Renntech tune?

Joncl

No I know a few that do and they have never had an issue and I searched on here and no one that has their tune has ever complained.

jcjmw

Do those with Renntech have the bigger TB?

Joncl

Yes

chiromikey

There are several of us that have logged the hiccup at constant throttle so I'm not sure this is what's happening...but I like the line of thought.

Has anyone actually linked this to the TB? To me that just never made sense and seemed to be more coincidence than anything else. I think it's more of a tuning virus. Tuners have copied each other's tunes for so long that we have a bad tune getting passed around under different brands. I'd like to see a tuner start from scratch and build a tune based off a perfectly running stock tune instead of loading their base and tweaking for mods.

Joncl

That's a good point I also think tuners all have each other's tunes and there's not that much difference between them really.

MAN55LE

chawkins2001

Thanks for giving us the opportunity to get your tune sorted brotha

Joncl

Chawkins are you saying you can fix the hiccup lean issue?